Made of polyester and lycra fabric which has strong moisture wicking ability and good elastic function. 3D structure and innovative design increase the evaporation of sweat and cooling area which can create a ideal air layer. In the hot environment, the vest will stay dry and cool. Believe it or not, Uriah Vest set will be a must have for your cycling journey. Size Tips: 1.Size Tag XS = Chest 33.8'', Front Length 20.4'', Back Length 26''; 2.Size Tag S = Chest 36.2'', Front Length 21.2'', Back Length 26.7''; 3.Size Tag M = Chest 38.5'', Front Length 22.0'', Back Length 27.5''; 4.Size Tag L = Chest 40.9'', Front Length 22.8'', Back Length 28.3''; 5.Size Tag XL = Chest 43.3'', Front Length 23.6'', Back Length 29.1''; 6.Size Tag XXL = Chest 45.6'', Front Length 24.4'', Back Length 29.9''; 7.Size Tag XXXL = Chest 48'', Front Length 25.2'', Back Length 30.7''; 8.Size Tag 4XL = Chest 50.4'', Front Length 26'', Back Length 31.5''; 9.Size Tag 5XL = Chest 52.7'', Front Length 26.7'', Back Length 32.2''; Kindly Notes: 1.Size Unit: INCH; Sizes belong to manual measurement and they are measured in flat-laid position; 2.This is not standard US Size Please view the size chart image or contact us before taking your order; 3.If you have any other concerns about the product, please feel free to contact our Uriah Customer Service and we will try our best to help you. Package Includes: 1 x Women's Cycling Vest Shorts set