We flattened out the fibers and added some science to create a game-changing fabric that quickly pulls heat away from the skin-keeping you calm, cool, and crushing at max capacity. Iso-Chill fabric helps disperse body heat, making it feel cool to the touch Mesh back panel for added breathability 4-way stretch construction moves better in every direction Material wicks sweat amp; dries really fast Reflective details for low-light runs 90% Nylon,10% Elastane THE SIZE CHART IS BASED ON UNIVERSAL SIZING DISCLAIMER: please allow +/- 1-3 cm in actual product SIZE (cm) : CHEST x WAIST XS: 79-86 x 71-74 S: 86-94 x 74-79 M: 94-104 x 79-86 L: 104-112 x 86-94 XL: 112-122 x 94-104 XXL: 122-132 x 104-116 3XL: 132-142 x 116-127 4XL: 142-152 x 127-138 5XL: 152-163 x 138-150