This product is made ofpolyester fibre. Don't let the sun keep you from doing things you enjoy! Do you love jogging, running, playing golf, baseball, football, basketball, riding a bike, hiking, driving around or going fishing? You can beat the heat and protect your skin rather than go bare under the sun, which can cause irritation, redness, sunburn, or any other skin problem. It's the best accessory for keeping your arms cool during summer activities and a highly effective sunblock.