Giro SPF30 Ultralight Skull Running Caps Enjoy warm, sunny rides with the SPF Ultralight Skull Cap. It's designed to be worn comfortably under your helmet, providing a UPF30+ rating to protect you from the sun. The combination of X-Static mesh and power mesh side panels ensures excellent breathability and moisture-wicking, so you can stay cool and dry. This cap is so thin and light that it practically disappears, leaving you to focus on the road ahead. Key Features for Warm-Weather Riding: UPF30+ Sun Protection: Provides crucial protection from the sun's harmful rays, helping you stay safe on long, exposed rides. Superior Comfort: The Smart Seam construction helps to alleviate pressure points from your helmet, ensuring a comfortable fit with no bunching. Moisture-Wicking & Breathable: The jersey mesh and power mesh side panels actively pull moisture away from your skin, keeping you cool and dry. Lightweight & Discreet: This cap is so light and thin that you'll barely know you're wearing it under your helmet. Specs & Materials: UPF Rating: 30+ Material: X-Static performance jersey mesh top panel (SPF 30), 96% polyester, 4% X-Static fiber Certification: CE EN1078 Best Use: Warm Weather, Sunny Rides, Road, Gravel