Take the guesswork out of layering as you head out for a bike ride. The 4U bamboo arm sleeves turn your T-shirt into a long-sleeve in just a few seconds. Super compact and light to fit easily in a jersey pocket. They're so comfortable you’ll want to wear them even when you’re not cycling. Travel lighter, and stay warmer! Features: * Made of antibacterial and sustainable bamboo fabric * Hidden thumb-loop for extra hand coverage * Useful for a variety of outdoor activities * Subtle branding * Shade your arms from the sun * Compact when folded – 5x4x9cm / 1.8x1.5x3.6" * Light weight – 60g / 2oz * One-Size Fits Most – 19.7” (55cm) wrist-to-armpit length * Compression fit