Ah, wool is the most magical of fibers! The Castelli Wool Long Sleeve Base Layer is constructed of ultra-fine merino wool for incredible softness. Wool is one of the best regulators of body temperature, due to it's ability to wick moisture and retain warmth even when wet. Unlike synthetics, wool doesn't smell like sweaty armpits after a few rides, due to natural antibacterial qualities. This base layer has a close fit and features flat-lock stitching that eliminates irritation.

• 100% Merino Wool
• Form-fit
• Flat lock stitching
• Flocked Castelli labels at neck and hem
• Recommended for 32 - 54 degrees