The one that started it all. When short sleeves leave your arms exposed, the Original Arm Sleeve steps in, covering you from wrist to bicep with ARPANSA-certified UPF 50+ protection that blocks 98% of UVA and UVB rays. Sparms' patented CoolTech fabric runs 2°C cooler than bare skin, pulling heat away as you move so comfort holds up whether you're on the course, the court, or anywhere the sun finds you.