The Everyday Leggings with Fly from Icebreaker are lightweight & super comfy. Using a 200g/m² pure merino rib-knit fabric, Icebreaker are one of only a few companies in the world that use the best quality, super fine merino fibers in their garments; this results in a non-itchy quality not normally associated with woolen fabrics. When you are warm the wool transports moisture away from the skin & the evaporation of this moisture helps to cool you down; however the merino fibres also contain millions of tiny air pockets that retain body heat to maintain you body temperature when the weather turns cold. Merino wool is naturally odour resistant because bacteria find it hard to hold onto the surface of the merino fibres, therefore it cant sit & multiply to create bad smells. These leggings are great on multi-day trips as you dont have to pack as much because because you can wear merino for a few days at a time without getting pongy. Great for active use or everyday wearing. They even have a fly opening for easy access when nature calls. Close Fit Great for outdoor & hiking Fly Lightweight Naturally odour-resistant Breathable Anti-chafe flatlock stitching