The bike clothing sizing guide – Trek Bikes

Cycling clothing is made for performance, comfort and style – but it needs to fit well to work well. Not all clothing 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 clothing and everywhere in between.

Trek men’s clothing

Our garments fit based on an athletic build and follow 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 sizing

Measurements on the sizing chart reflect the actual measurements of the body’s circumference (not 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 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 rib cage. 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.

Model is 6’1” (185 cm), waist 31” (79 cm), wearing size medium

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

A fitted cut provides a streamlined body fit for enhanced performance.

Semi-fitted

A semi-fitted cut leaves room for movement without hindering performance.

MTB Semi-fitted

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

Trek women’s clothing

Our garments fit based on an athletic build and follow 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 sizing

Measurements on the sizing chart reflect the actual measurements of the body’s circumference (not 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 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 rib cage. The measuring tape should be close to the body but not snug.
3HIP
Wrap the measuring tape around the fullest part of the hips and buttocks. Keep the measuring tape parallel to the ground.

Model is 5’7” (170 cm), waist 27” (69 cm), wearing size small.

Browse jerseys
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

A fitted cut provides a streamlined body fit for enhanced performance.

Semi-fitted

A semi-fitted cut leaves room for movement without hindering performance.

MTB Semi-fitted

A 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 shoe sizing

The Size Conversion Chart below shows how Trek and Bontrager's sizing compares to other common sizing scales. However, because the fit of Trek and Bontrager cycling shoes are optimised for on-bike comfort and performance, your Trek and Bontrager shoe size may be different from that of your street shoe or athletic shoe sizing. For best results, visit your local Trek and Bontrager shoe retailer.

The chart below also includes a foot-length conversion scale (in both inches and cm). Follow the steps to measure your foot length correctly and then consult the conversion chart to determine your Trek and Bontrager shoe size.

Shop all shoes
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 Men 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
US Women 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5
UK Men 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
UK Women 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 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

Determining your Trek and Bontrager shoe size

Don't have a Brannock device at home? Not to worry, follow the instructions below for at-home sizing or pop into your local Trek retailer to be properly measured.

Step 1

To measure your feet, start by wearing the socks that you typically ride in and lay a blank piece of paper on a hard, smooth surface.

Step 2

While standing, distribute your weight evenly and have someone trace each foot with a pencil taking extra care around the toes and heel areas.

Step 3

If you are working alone, sit down on a chair and lean forward to shift more weight onto the foot you are going to trace.

Step 4

On your outline, measure the distance from the heel line to your longest toe line and cross-reference with our sizing chart above. If your feet are different lengths, use the longer of the two measurements.

Shoes are built around a three-dimensional mould called a last. A last's shape can vary, and this affects a shoe's width, depth, height and overall fit. In other words, fit is about more than your shoe size. Bontrager offers shoes built around several different lasts. Here's what you need to know about lasts to choose the shoe that's right for you.

Trek Pro last

Same high-performance fit as Bontrager's InForm Pro last, but updated to better match the average foot shape.

inForm Race last

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

inForm Performance last

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

inForm Athletic last

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

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

Compare your arch impression to the Trek Arch Index below to find which of the three insole heights best fits your arch profile.

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 sizing

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 HAND
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 warmer sizing

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 19 ¼ + 49 15 ½ + 39 7 + 18

Knee warmer sizing

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

Leg warmer sizing

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

Size Length of Warmer Thigh Ankle
inches cm inches cm inches cm
XS < 25 1/4 64 < 20 51 < 9 23
S 25 7/8 65 20-21 1/2 51-55 9-9 1/2 23-24
M 26 66 21 1/2-23 55-58 9 1/2-10 24-25
L 26 3/8 67 23-24 1/2 58-62 10-10 1/2 25-27
XL 26 3/4+ 68 24 1/2+ 62 10 1/2+ 27

Sock sizing

Trek sock sizing is based on shoe size. To determine your appropriate sock size, examine the chart below and choose the size range that includes your shoe size.

  EU US Men US Women UK
S 36-39 4-6 5.5-7.5 3-5
M 40-42 8.5-10.5 9.0-11.0 6-8
L 43-45 10-12 11.5-13.5 9-11
XL 46-48 13-15 N/A 12-14

Shoe cover sizing

Bontrager shoe cover sizing is based on shoe size. To determine your appropriate shoe cover size, examine the chart below and choose the size range that includes your shoe size.

 

  EU US Men US Women UK
S < 40 < 7 < 8 < 6.5
M 40.5-42 7.5-9 8.5-10.5 7-8.5
L 42.5-44 9.5-11 11.5+ 9-10.5
XL 44.5-46 11.5-13   11-12.5
2XL 46.5+ 13.5+   13+

Santini’s men’s and women’s clothing

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

Santini men’s clothing 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 INSIDE LEG
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 clothing
size-table
Size Rider Height Chest Waist
XS

169 - 173 cm

5'7" - 5'8"

88 - 92 cm

35" - 36" (89 cm – 91 cm)

74 - 78 cm

29" - 31"

S

172 - 176 cm

5'8" - 5'9"

92 - 96 cm

36" – 38" (91 cm – 98 cm)

78 - 82 cm

31" - 32" (79 cm – 81 cm)

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" (86 cm – 89 cm)

XL

181 - 185 cm

5'11" – 6'1" (180 cm – 187 cm)

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 clothing 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 INSIDE LEG
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 clothing
size-table
Size Rider Height Chest Waist
XS

160 - 163 cm

5'3" - 5'4"

78 - 82 cm

31" - 32" (79 cm – 81 cm)

60 - 64 cm

24" - 25"

S

164 - 170 cm

5'5" – 5'7" (165 cm – 172 cm)

82 - 86 cm

32" - 34"

64 - 68 cm

25" - 27"

M

167 - 173 cm

5'6" - 5'8"

86 - 90 cm

34" - 35" (86 cm – 89 cm)

68 - 72 cm

27" - 28"

L

170 - 176 cm

5'7" - 5'9"

90 - 94 cm

35" - 37"

72 - 76 cm

28" - 30" (71 cm – 76 cm)

XL

173 - 179 cm

5'8" – 5'10" (173 cm – 179 cm)

94 - 100 cm

37" - 39"

76 - 80 cm

30" - 31" (76 cm – 79 cm)