These Duofold Originals use only the finest wool in their blends. The Duofold Authentic 2 Layer Wool Blend Union Suit features the finest in quality and craftmanship. Unique fabric construction utilizes the warmth of wool with a comfortable all cotton lining - 25% wool blend outer layer for warmth and 100% cotton inner layer for comfort. Lycra reinforced cuffs for a more secure fit. Flat seams throughout prevents chafing.