Trek/Bontrager fit and sizing

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 ours measures up. Here's everything you need to know to find the perfect size and cut for the way you ride.

Find your way

Men's clothing sizing

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

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.

Pro fit, fitted, semi-fitted and loose fit

Looking for teamwear? See sizing guides from Santini here

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.

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

Women's clothing sizing

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

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.

Pro fit, fitted, semi-fitted and loose fit

Looking for teamwear? 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

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.

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

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 19 ¼ + 49 15 ½ + 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

Leg warmers

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

Socks

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 covers

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+

Helmets

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.

Browse 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

Bontrager shoe sizing

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

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 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.

Inform Pro last

A high-performance toe spring with a secure fit for ultimate efficiency.

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

Arch
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