GREEN FANS Men's Classic-Fit Solid Pique Polo Shirt With Pony, it is made of 100% Cotton. This is a short sleeve pique polo shirt, flat knit collar and rib cuff.About GREEN FANS POLO We use high-quality combed cotton yarn, and it is one kind of fiber. Firstly, the fiber has a high gloss and smooth surface. Secondly, the fiber is of uniform thickness, and has a high strength, so it can be washed many times, and it is not easy to pilling and not easy to deformation. Combed cotton is long and tidy, so the fiber is better breathable, and highly absorbent . In a word, it can make you comfortable.We use new types of environmentally reactive dyes and the fabric rubbing fastness is strong and not easy to fade.we use ultra-thin fiber yarn and has undergone heat treatment under normal tension,the shirt will not shrink easily. Note: Size chart provided by Amazon is relatively small, and not applying to our size chart. Our polo is casual clothes with classic fit.If you are not sure about your size, Please refer to the size chart listed below:US Small--------Chest 42"----Shoulder 17"-----Sleeve 9.5"-----Length 28.7"US Medium-------Chest 45"----Shoulder 18"-----Sleeve 10"------Length 29.7"US Large--------Chest 48"----Shoulder 18.5"---Sleeve 10.2"----Length 30.7"US X-Large------Chest 51"----Shoulder 19"-----Sleeve 10.6"----Length 31.7"US XX-Large-----Chest 54"----Shouledr 20"-----Sleeve 11"------Length 32.7"