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Need Help With Sizing? Fill Out the Form, Get a Free FitKit.
The ThermApparel Fit Kit is loaded with tips and suggestions and a handy measuring tape so you will get the correct size when you order. Fill out the form below and we will send you a FitKit!
NEW SIZING!! UnderCool 3.0 Sizing Guide
3.0 Sizing Tip: If you are in between 2 sizes order the LARGER size.
| Size | Natural Waist | |
|---|---|---|
| Extra Extra Small - XXS | 18" - 24" |
46 cm - 61 cm |
| Small |
24" - 31" |
61 cm - 78 cm |
| Medium |
31" - 40" |
78 cm - 101 cm |
| Large |
40" - 51" |
101 cm - 129 cm |
| Extra Extra Large - XXL | 51" - 64" |
129 cm - 162 cm |
Sizing Tips for 3.0:
- Sizing is based on your natural waist, not your hips or pant size.
- Measure against your skin.
- Take your measurements in front of a mirror.
- Make sure your tape measure is level on both sides.
- UnderCool needs to fit your body like a glove to give you the best cooling support.
- If you are in between 2 sizes, order the Larger size.
UnderCool 2.0 Sizing Guide
| Size | Natural Waist | |
|---|---|---|
| Extra Extra Small - XXS | 20" - 24" |
51 cm - 61 cm |
| Extra Small | 25" - 28" |
61 cm - 71 cm |
| Small |
29" - 34" |
71 cm - 81 cm |
| Medium |
35" - 40" |
86 cm - 97 cm |
| Large |
41" - 46" |
102 cm - 116 cm |
| Extra Large - XL |
47" - 55" |
121 cm - 132 cm |
| Extra Extra Large - XXL | 56" - 61" |
140 cm - 152 cm |
Sizing Tips for 2.0:
- Sizing is based on your natural waist, not your hips or pant size.
- Measure against your skin.
- Take your measurements in front of a mirror.
- Make sure your tape measure is level on both sides.
- UnderCool needs to fit your body like a glove to give you the best cooling support. \
- If you are in between 2 sizes, order the smaller size.
Womens Sizing Guide:
- Sizing is dependent on natural waist size not bust size.
1. Stand or sit up
straight and tall.
2. Bend at both sides.
Where you naturally
bend in your natural
waist.
3. Measure where you bend. If you don't bend measure below rib cage but above belly button.
Men's Sizing Guide:
- We recommend ordering a size smaller than your usual T-shirt size.
- (If you wear a large T-shirt, a medium UnderCool will fit best.)
- Sizing is dependent on your natural waist size, not hip or belt size
1. Stand or sit up
straight and tall.
2. Bend at both sides.
Where you naturally
bend in your natural
waist.
3. Measure where you bend. If you don't bend measure below rib cage but above belly button.
Don’t Have a Fabric Measuring Tape?
You can measure your waist the same way with a straight ruler and:
String / Yarn
Dental Floss
Shoelace
Charging cord from your phone
