The Castelli Bandito Wool Long Sleeve Base Layer, one of the brand's warmest, is made from a combination of merino wool, recycled polyester, and a touch of elastane. This blend provides warmth, wicking, durability, and stretch. You'll find this base layer so comfortable that you'll never want to take it off.Designed for medium intensity, cold weather rides, this base layer fits closely with a high collar and long sleeves to keep your neck and wrists cozy. It is conveniently machine washable and will keep you dry and fresh while out on the trails on a winter's day.Key features:- Blends warmth with moisture management- Made from 125g/m² 48% merino wool, 47% recycled polyester, 5% elastane fabric- High collar, long sleeves- Machine washable- Weighs 141g (medium size)- For use at temperatures from -4-10?C, 25-50?F.