The Echo Boxer Briefs are designed with bluesign-approved materials for those who want the perfect combination of performance and comfort while hiking, climbing, skiing, or any other active pursuit.Built with AirVent moisture management and ActiveFresh odor control technologies, they weigh only 2 oz, pack down small, and dry quickly. Anti-chafing flat-seam construction ensures a comfortable fit.Designed to support and breathe, the Echo Boxer Brief is an ideal base layer for pursuing your outdoor passion.