The bike apparel sizing guide - Trek Bikes

Cycling apparel is made for performance, comfort, and style — but it needs to fit well to work well. Not all apparel fits the same, so check out the sizing guides below to see how all of our brands measure up. Here's everything you need to know to find the perfect size and cut for the way you ride, from road kits to mountain bike apparel, and everywhere in between.

MEN'S CLOTHING SIZING

Bontrager garment fit is based on an athletic build, and follows true sizing. Reference the clothing size chart to identify your size, then see the item's fit profile to understand how the silhouette will move with your body.

MEN'S CLOTHING

Measurements on the sizing chart reflect the actual measurements of the body’s circumference (not the product’s measurements). Use a cloth measuring tape to measure your body. All measurements should be taken while standing up straight with feet shoulder width apart. For maximum accuracy, take measurements next to skin.

1CHEST

Measure around the fullest part of your chest under your armpits with your arms relaxed at your sides. Keep the measuring tape parallel to the ground.

2WAIST

Measure around the natural waist, which falls at the natural curve of the body—the indentation between the hips and the ribcage. The measuring tape should be close to the body but not snug.

3HIPS

Wrap the measuring tape around the fullest part of the hips and buttocks. Keep the measuring tape parallel to the ground.

Shop the jerseys
Size CHEST WAIST HIP
inches cm inches cm inches cm
XS 33-35 84-89 27-29 68-74 33-35 84-89
S 35-37 89-94 29-31 74-79 35-37 89-94
M 38-40 96-102 32-34 81-86 38-40 96-102
L 41-43 104-109 35-37 89-94 41-43 104-109
XL 44-46 112-117 38-41 97-104 44-46 112-117
2XL 47-49 119-124 42-45 106-114 47-49 119-124
3XL 50-52 127-132 45-48 114-122 50-52 127-132

Pro Fit

Pro Fit is cut straight from the peloton providing second-skin aerodynamic performance.

Fitted

Fitted cut provides streamlined body fit for enhanced performance.

Semi-fitted

Semi-fitted cut leaves room for movement without hindering performance.

MTB Semi-fitted

Loose fit allows for freedom of non-restrictive movement and casual style.

WOMEN'S CLOTHING SIZING

Bontrager garment fit is based on an athletic build, and follows true sizing. Reference the clothing size chart to identify your size, then see the item's fit profile to understand how the silhouette will move with your body.

WOMEN'S CLOTHING

Measurements on the sizing chart reflect the actual measurements of the body’s circumference (not the product’s measurements). Use a cloth measuring tape to measure your body. All measurements should be taken while standing up straight with feet shoulder width apart. For maximum accuracy, take measurements next to skin.

1 BUST

Measure around the fullest part of your chest under your armpits with your arms relaxed at your sides. Keep the measuring tape parallel to the ground.

2 WAIST

Measure around the natural waist, which falls at the natural curve of the body—the indentation between the hips and the ribcage. The measuring tape should be close to the body but not snug.

3 HIP

Wrap the measuring tape around the fullest part of the hips and buttocks. Keep the measuring tape parallel to the ground.

Shop jerseys

Pro fit, fitted, semi-fitted, and loose fit

Looking for team apparel? See sizing guides from Santini here

Size BUST WAIST HIP
inches cm inches cm inches cm
XS (2-4) 32"-33" 81-84 24"-26" 61-66 33"-35" 84-89
S (4-6) 33"-34" 84-86 26"-28" 66-71 35"-37" 89-94
M(6-8) 34"-36" 86-91 28"-30" 71-76 37"-39" 94-99
L (10-12) 36"-38" 91-97 30"-32" 76-81 39"-41" 99-104
XL (12-14) 38"-40" 97-102 32"-34" 81- 84 41"-43" 104-109
2XL (16-18) 41"-44" 104-112 35"-38" 89-97 44"-47" 112-119
3XL (18-20) 44"-47" 112-119 38"-41" 97-104 47"-50" 119-127
4XL (22-24) 48"-51" 122-129 42"-45" 107-114 51"-54" 130-137

Fitted

Fitted cut provides streamlined body fit for enhanced performance.

Semi-fitted

Semi-fitted cut leaves room for movement without hindering performance.

MTB Semi-fitted

Loose fit allows for freedom of non-restrictive movement and casual style.

Trek helmet sizing

Measure the circumference of your head using a cloth tape measure or a piece of string and a ruler. Be sure to measure horizontally across your brow and over your ears. Use the chart below to find the proper helmet size based on your measurement.

Shop helmets
Helmet size Fit range (cm) 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
Toddler 46-50 Toddler
Child 48-52 Child
Youth / XS 50-55 Youth / XS
Small 51-57 Small
S/M 51-58 S/M
Medium 54-60 Medium
M/L 55-61 M/L
Large 58-63 Large
X-Large 60-66 X-Large

Trek and Bontrager cycling shoe sizing is optimized for on-bike comfort and performance. Whether you’re on the hunt for bike shoes for wide feet or the optimal race-performance cycling shoe, we’ve got you covered. Use this bike shoe size chart to learn how to measure your foot, discover the last and insoles made to deliver the performance you crave, and ride away with that juuuust right fit.

Men

EU 36 37 37.5 38 38.5 39 39.5 40 40.5 41 41.5 42 42.5 43 43.5 44 44.5 45 45.5 46 46.5 47 48 49
US 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15
UK 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14
CM 23 23.7 24 24.3 24.7 25 25.3 25.7 26 26.3 26.7 27 27.3 27.7 28 28.3 28.7 29 29.3 29.7 30 30.3 31 31.7
Heel-to-Toe (cm) 22.4 23.1 23.4 23.7 24.0 24.3 24.6 25.0 25.3 25.5 25.9 26.2 26.5 26.9 27.1 27.4 27.8 28.1 28.3 28.7 29.0 29.3 29.9 30.6
Heel-to-Toe (in) 8 ⅞ 9 ⅛ 9 ¼ 9 ⅜ 9 ½ 9 ⅝ 9 ¾ 9 ⅞ 10 10 ⅛ 10 ¼ 10 ⅜ 10 ½ 10 ⅝ 10 ¾ 10 ⅞ 11 11 ⅛ 11 ¼ 11 ⅜ 11 ½ 11 ⅝ 11 ⅞ 12 ⅛

Women

EU 36 37 37.5 38 38.5 39 39.5 40 40.5 41 41.5 42 42.5 43
US 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5
UK 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5
CM 23 23.7 24 24.3 24.7 25 25.3 25.7 26 26.3 26.7 27 27.3 27.7
Heel-to-Toe (cm) 22.4 23.1 23.4 23.7 24.0 24.3 24.6 25.0 25.3 25.5 25.9 26.2 26.5 26.9
Heel-to-Toe (in) 8 ⅞ 9 ⅛ 9 ¼ 9 ⅜ 9 ½ 9 ⅝ 9 ¾ 9 ⅞ 10 10 ⅛ 10 ¼ 10 ⅜ 10 ½ 10 ⅝
Determining your Trek and Bontrager shoe size

The perfect bike shoe for you may be a different size than your favorite street or athletic shoes. Grab a piece of paper, a pencil, a friend, and follow the instructions below for a simple step-by-step guide to measuring your feet at home — no Brannock device needed.

Step 1

To measure your feet, start by wearing socks you typically ride in and set a blank piece of paper on a hard, smooth surface, against a wall. Stand on the paper with your heel against the wall.

Step 2

While standing on the paper, have your friend trace your foot with a pencil taking extra care around the toe and heel areas. If someone else isn’t around, give it a try on your own!

Step 3

Flip over your piece of paper and repeat steps 1 and 2 on your other foot ­— you’ll want to have measurements of both feet.

Step 4

For both feet, measure the distance from the heel line to your longest toe line and cross-reference with our sizing chart above to identify your correct size. If you are between sizes, round up to the nearest size.  If your feet are different lengths, use the longer of the two measurements.

Shoes are built around a three-dimensional mold called a last. Last shapes vary widely based on brand, shoe lines within the brand, and performance goals of the shoe, all impacting the width, depth, height, and overall shoe fit. In other words, fit is about more than just your shoe size.  

Trek and Bontrager offer shoes built around several different lasts to accommodate a tighter, race-ready fit, a more comfortable performance fit, wide fits, and more. Here's what you need to know about our lasts to choose the shoe that's right for you.

Trek Pro Last

This last has a snug, high-performance fit that’s optimized for power transfer. This last replaces the Bontrager inForm Pro last but is slightly wider across the ball of the foot, providing a better fit for more riders.

Trek Comp Last

Get a performance fit with a little more room. Trek Comp Last replaces the Bontrager inForm Race Last but has been updated to better fit the average rider’s foot by widening the area across the ball of the foot.

Bontrager inForm 
Race Last

A performance fit with a slightly roomier fit from the ball through the mid-foot.

Bontrager inForm Performance Last

Relaxed fit with a flatter foot position for more versatility and utility.

Bontrager inForm Athletic Last

Relaxed, roomier fit similar to a cross-trainer to combine on-bike and off-bike comfort.

Find your perfect insole

Cycling shoes help you get the most power out of every pedal stroke, and they can do an even better job when every part of your foot is supported. To give your foot the support it needs, insoles are a great addition. Here’s how to find the right insole for your foot using just two pieces of dark-colored paper and a flat dish of water.

Step 1

Start by placing your bare foot in a small amount of water, ensuring that the entire bottom of your foot gets wet.

Step 2

Carefully place your wet foot on a on a darker piece of paper so it leaves a visual impression of your unweighted arch.

Step 3

Dry off your foot, then while the impression is wet, compare it with the Trek Arch Index below to find which of the three insole heights best fits your arch profile. Repeat the steps with your other foot.

Arch

Accessories

When it comes to cycling gear, the small stuff holds a lot of power. Think about it: a little discomfort from your gloves, socks, or other accessories can have a huge impact on your mood and the quality of your ride. Bontrager always designs for comfort, but getting the right size is important. Here's how to choose Bontrager accessories that will fit and feel great on every ride.

GLOVES

A glove that fits properly will not constrict motion. Bontrager gloves are anatomically designed for a no-bunch fit. To find your appropriate size, measure the circumference of your hand using a cloth tape measure or a piece of string and a ruler. Use the chart below to determine the proper glove size based on your measurement.

MEN'S SIZE WOMEN'S SIZE 1HAND
cm inches
XS 16-17.5 6.5-7
XS S 17.5-19 7-7.5
S M 19-20.5 7.5-8
M L 20.5-23 8-9
L 23-25.5 9-10
XL 25.5-28 10-11
2XL 28-30.5 11-12

ARM WARMERS

Using a cloth tape measure or a piece of string and a ruler, measure the circumference of your wrist, the circumference of your bicep and the length of your arm. Use the chart below to determine the proper arm warmer size based on your measurements.

 

Size Length of Warmer Bicep Wrist
inches cm inches cm inches cm
XS < 17¾ 45 < 10 ½ 26 < 6 ¼ 16
S 18 ⅛ 46 10½-11 ½ 27-29 6¼-6 ½ 16-17
M 18 ½ 47 11½-13 ½ 29-34 6½-6 ¾ 16-17
L 18 ⅞ 48 13½-15 ½ 34-39 6¾-7 17-18
XL 19¼ + 49 15½ + 39 7 + 18

KNEE WARMERS

Using a cloth tape measure or a piece of string and a ruler, measure the circumference of your calf and the circumference of your thigh. Use the chart below to determine the proper knee warmer size based on your measurements.

Size Length of Warmer Thigh Calf
inches cm inches cm inches cm
XS < 14 ¾ 37 < 17 43 < 13 33
S 15 ⅛ 38 17-18 ½ 43-47 13-14 33-36
M 15 ½ 39 18½-20 47-51 14-15 36-38
L 15 ⅞ 40 20-21 ½ 51-55 15-16 38-41
XL 16 ¼+ 41 21 ½ + 55 16 + 41

Santini’s men’s and women’s apparel

Santini’s apparel is designed around an athletic, European fit. Explore the sizing charts below to determine the right size garment for you.

Santini men’s apparel sizing

1 CHEST
Measure around the fullest part of your chest under your armpits with your arms relaxed at your sides. Keep the measuring tape parallel to the ground.

2 WAIST
Measure around the natural waist, which falls at the natural curve of the body — the indentation between the hips and the ribcage. The measuring tape should be close to the body, but not snug.

3 INSEAM
Measure from the crotch to the bottom of the leg (or desired length of hem), running vertically down the inside of the leg.

Shop Santini men’s apparel
size-table
Size Rider Height Chest Waist
XS

169 - 173 cm

5'7" - 5'8"

88 - 92 cm

35" - 36"

74 - 78 cm

29" - 31"

S

172 - 176 cm

5'8" - 5'9"

92 - 96 cm

36" - 38"

78 - 82 cm

31" - 32"

M

175 - 179 cm

5'9" - 5'10"

96 - 100 cm

38" - 39"

82 - 86 cm

32" - 34"

L

178 - 182 cm

5'10" - 6'0"

100 - 104 cm

39" - 41"

86 - 90 cm

34" - 35"

XL

181 - 185 cm

5'11" - 6'1"

104 - 108 cm

41" - 43"

90 - 94 cm

35" - 37"

2XL

184 - 188 cm

6'0" - 6'2"

108 - 112 cm

43" - 44"

94 - 98 cm

37" - 39"

Santini women’s apparel sizing

1 CHEST
Measure around the fullest part of your chest under your armpits with your arms relaxed at your sides. Keep the measuring tape parallel to the ground.

2 WAIST
Measure around the natural waist, which falls at the natural curve of the body — the indentation between the hips and the ribcage. The measuring tape should be close to the body, but not snug.

3 HIPS
Stand with your feet together and measure around the fullest point of the hip, keeping the tape measure horizontal​.​​

4 INSEAM
Measure from the crotch to the bottom of the leg (or desired length of hem), running vertically down the inside of the leg.

Shop Santini women’s apparel
size-table
Size Rider Height Chest Waist
XS

160 - 163 cm

5'3" - 5'4"

78 - 82 cm

31" - 32"

60 - 64 cm

24" - 25"

S

164 - 170 cm

5'5" - 5'7"

82 - 86 cm

32" - 34"

64 - 68 cm

25" - 27"

M

167 - 173 cm

5'6" - 5'8"

86 - 90 cm

34" - 35"

68 - 72 cm

27" - 28"

L

170 - 176 cm

5'7" - 5'9"

90 - 94 cm

35" - 37"

72 - 76 cm

28" - 30"

XL

173 - 179 cm

5'8" - 5'10"

94 - 100 cm

37" - 39"

76 - 80 cm

30" - 31"

Fox Racing men’s and women’s apparel

Fox Racing apparel is designed for an athletic build. Reference the charts below to find your recommended size, then explore the product’s details to determine how snug or loose it will fit on your body.

Fox Racing men’s jersey sizing

1 CHEST
Place a fabric tape measure around the fullest part of the chest, under the arms.

2 SLEEVE LENGTH
Measure from the center of the back of your neck to your wrist.

3 BICEP
Measure the circumference of the fullest part of the bicep.

Shop Fox Racing men's jerseys
size-table
Size Chest Rider Height
S

89 - 94 cm

35" - 37"

168 - 173 cm

5'6" - 5'8"

M

97 - 102 cm

38" - 40"

173 - 178 cm

5'8" - 5'10"

L

104 - 109 cm

41" - 43"

178 - 183 cm

5'10" - 6'0"

XL

112 - 117 cm

44" - 46"

180 - 185 cm

5'11" - 6'1"

2XL

119 - 125 cm

47" - 49"

183 - 188 cm

6'0" - 6'2"

Fox Racing men's pants sizing

1 WAIST
Measure the circumference by placing a tape measure around your bare stomach just above the upper hip bone.

2 HIPS
Measure the circumference about 23cm/9in below the waistline. Stand with feet together.

3 INSEAM
Measure from the crotch to the bottom of the leg (or desired length of hem), running vertically down the inside of the leg.

Shop Fox Racing men's pants
size-table
Size Waist Hip Inseam Rider Height
28

76 cm

30"

86 - 89 cm

34" - 35"

71 cm

28"

168 - 173 cm

5'6" - 5'8"

30

81 cm

32"

91 - 94 cm

36" - 37"

72 cm

28"

173 - 178 cm

5'8" - 5'10"

32

86 cm

34"

97 - 99 cm

38" - 39"

74 cm

29"

173 - 178 cm

5'8" - 5'10"

34

91 cm

36"

102 - 104 cm

40" - 41"

75 cm

30"

178 - 183 cm

5'10" - 6'0"

36

97 cm

38"

107 - 109 cm

42" - 43"

76 cm

30"

180 - 185 cm

5'11" - 6'1"

38

102 cm

40"

112 - 114 cm

44" - 45"

78 cm

31"

183 - 188 cm

6'0" - 6'2"

Shorts

size-table
Size Waist Hip Rider Height
30

81 cm

32"

91 - 94 cm

36" - 37"

173 - 178 cm

5'8" - 5'10"

32

86 cm

34"

97 - 99 cm

38" - 39"

173 - 178 cm

5'8" - 5'10"

34

91 cm

36"

102 - 104 cm

40" - 41"

178 - 183 cm

5'10" - 6'0"

36

97 cm

38"

107 - 109 cm

42" - 43"

180 - 185 cm

5'11" - 6'1"

Fox Racing women’s jersey sizing

1 CHEST
Place a fabric tape measure around the fullest part of the chest, under the arms.

2 SLEEVE LENGTH
Measure from the center of the back of your neck to your wrist.

3 WAIST
Measure the circumference by placing a tape measure around your bare stomach just above the upper hip bone.

Shop Fox Racing women's jerseys
size-table
Size Chest Waist Hip
S

86 - 89 cm

34" - 35"

66 - 69 cm

26" - 27"

93 - 95 cm

37" - 37"

M

91 - 94 cm

36" - 37"

71 - 75 cm

28" - 30"

98 - 102 cm

39" - 40"

L

97 - 102 cm

38" - 40"

79 - 83 cm

31" - 33"

103 - 109 cm

41" - 43"

XL

104 - 109 cm

41" - 43"

86 - 90 cm

34" - 35"

113 cm

44"

size-table
Size Waist Hip Inseam Rider Height
S

66 - 69 cm

26" - 27"

95 - 99 cm

37" - 39"

68 cm

27"

160 - 168 cm

5'3" - 5'6"

M

71 - 75 cm

28" - 30"

100 - 105 cm

39" - 41"

69 cm

27"

165 - 173 cm

5'5" - 5'8"

L

79 - 83 cm

31" - 33"

107 - 114 cm

42" - 45"

71 cm

28"

168 - 175 cm

5'6" - 5'9"

XL

86 - 90 cm

34" - 35"

116 - 118 cm

46" - 46"

72 cm

28"

170 - 178 cm

5'7" - 5'10"

2XL

94 - 98 cm

37" - 39"

121 - 124 cm

48" - 49"

72 cm

28"

170 - 178 cm

5'7" - 5'10"

Fox Racing women’s pants sizing

1 WAIST
Measure the circumference by placing a tape measure around your bare stomach just above the upper hip bone.

2 HIPS
Measure the circumference about 23cm/9in below the waistline. Stand with feet together.

3 INSEAM
Measure from the crotch to the bottom of the leg (or desired length of hem), running vertically down the inside of the leg.

4 THIGH
Measure the thigh circumference by placing a fabric measuring tape around the fullest part of the thigh, below the crotch.

Shop Fox Racing women's pants

Shorts

size-table
Size Waist Rider Height
S

66 - 69 cm

26" - 27"

160 - 168 cm

5'3" - 5'6"

M

71 - 75 cm

28" - 30"

165 - 173 cm

5'5" - 5'8"

L

79 - 83 cm

31" - 33"

168 - 175 cm

5'6" - 5'9"

XL

86 - 90 cm

34" - 35"

170 - 178 cm

5'7" - 5'10"

2XL

94 - 98 cm

37" - 39"

170 - 178 cm

5'7" - 5'10"