Size Chest and Waist Circumference
Vest Length
Weight Range
Number of Packs
35" to 49"
21.5" to 23"
~ 125 to 175 lbs.
37" to 51"
24.5" to 25"
~ 175 to 310 lbs.
38" to 63"
25.5" to 27"
~ 275 to 360 lbs.

How to find your size:

This vest is adjustable at the shoulders, chest and waist. Therefore, it will fit a wide range of body types. These measurements may help determine the best size for you.
  • To measure the chest and waist circumference: First, wrap a soft measuring tape around the fullest part of your chest and under your armpits, making sure to keep the tape parallel to the ground. This determines your chest measurement. Then wrap a measuring tape around your natural waistline (usually across your belly button), making sure to keep the tape parallel to the ground. See where the larger of the two measurements fall on the size chart.Please note: The vest circumference is independently adjustable at the chest and waist with hook and loop strap closures. if you think you are in between two sizes, order the next size up to accommodate the cooling packs.
  • To measure the vest length: Hold the tape measure at the highest point of your shoulder. Look straight ahead and pull it down to your natural waist. Mark this measurement on the tape measure with your thumb. Please note: The vest length can be adjusted at the shoulders. When in doubt, order the next size up to accommodate the cooling packs and to prevent the vest from looking too short.
  • Please note: the weight range is simply a guide; there are many exceptions for different body types. The optional extension strap kit includes extension straps for the waist, chest and shoulders. The extension strap kit adds up to 20" in circumference and 5" in length to any vest size. This allows an extra fit adjustment for large people, extra long torsos or extra large chests or waists on smaller people. Click here to purchase the extension strap kit.

Our Customer Care team is here to answer product questions and provide additional details and measurements. Just give us a call at 1-800-763-8423 or send us an e-mail. We are happy to help!