Ridge Merino Wool Men's Ridge Boxer Importado Natural, sustainable and biodegradable Merino Wool 170g Flatlocked seams, printed label and removable care label for max comfort 76% Merino Wool, 19% Nylon, 5% Spandex Outside Magazine named the Ridge Men's Boxer Best Performance Underwear for Multi-Day Off-the-Grid Trips Soft Merino wool with (m)Force Merino technology, a nylon core-spun Merino wool to improve strength and reduce abrasion Soft: no itch, premium ultra-fine 18.5-micron fibers feel great against your skin Climate control: Natural temperature regulation means Ridge insulates when its cold and lets heat escape when temperatures rise Moisture management: Ridge natural fibers wick moisture away from your skin to prevent clamminess No stink: Merino wool naturally and permanently resists odor without the use of chemicals Sun Protection: UPF 50+ certified