I'm selling this item because it was a little tight when I tried it on my right arm after purchasing it. Although it is new and unused, please be aware of this. These arm sleeves are made of UPF 50 HeatGear material, which provides comfort while protecting against sunburn. - Model Name: ARM SLEEVES - UPF: 50 - Color: Navy - Material: HeatGear - Size: S Arm Cover Baseball Marathon Thank you for looking.