These Anatomica Briefs use a blend of Merino Wool and synthetic nylon and Lycra to create the super comfortable, stretchy brief.Icebreaker says:Slim-fit merino wool briefs made with our corespun fabric, the Anatomica Briefs offer the support and comfort you need in a classic underwear design.Our VerdictThis lightweight, breathable brief is comfortable and ideal for warm conditions and intense activities with less leg coverage. They are stretchy and super comfortable whether you’re hiking for days, stretching during climbs or running your local trails. Although designed for warmer conditions they work just as well the rest of the year too. A number of our staff have used Anatomica boxers for all their serious treks, from Scottish winter epics to summer multiday adventures.- Reviewed by Ultralight Outdoor GearPlease note that for hygiene reasons this product is non-returnable unless faulty.FeaturesMerino Corespun – durable merino blend regulates body temperature in all weather conditionsContoured pouch for comfortFlatlock seams to prevent frictionSpecificationsSmall weighs: 37gMedium weighs: 40gLarge weighs: 44gXLarge weighs: 50gMaterial & ConstructionFabric Main: Merino Jersey Corespun, 83% Merino Wool, 12% Nylon, 5% LYCRAFibre micron: Merino Wool 18.9 micronFit: SlimHelp & advice:The Ultimate Guide to Lightweight BaselayersThe Benefits of Merino Wool

These Anatomica Briefs use a blend of Merino Wool and synthetic nylon and Lycra to create the super comfortable, stretchy brief.Icebreaker says:Slim-fit merino wool briefs made with our corespun fabric, the Anato