Now with Polygiene technology, Buff products are cleaner and wont stink like a trooper after your workout. * Polartec Classic 100. Provides warmth without weight. Extremely breathable. Provides the right level of insulation for most outdoor activities. Maintains body temperature and prevents heat loss. * High protection against cold and wind, breathable and elastic. * Machine washable and no need to iron. * One size fits most: 53cm-62cm