These cooling arm sleeves are made of milk silk fabric material, which is so lightweight and breathable, featuring good elasticity and can fit your arm's size better, wearing it allows air flow, dry quickly and can make you feel cool and refreshed, comfortable for you to wear. And these sunscreen arm sleeves can be applied for uv protection, protect you from sunburn, keeping you to feel cool and dry while wearing, good items for summer, it can also make you warmer in winter. 7.87" L x 15.75" W