How to use: Simply put on the Castelli Sleeveless Pro Mesh Baselayer directly against your skin. It can be worn alone in mild weather or layered under other clothing in colder conditions. Notice: Avoid sharp objects that could tear the mesh fabric. When exercising, make sure the base layer fits well to ensure maximum performance. Maintenance: Wash it in cold water with mild detergent. Do not bleach. Hang it to dry to maintain its shape and elasticity.