Some folks want a little extra convenience when they are all layered up, so Icebreaker adds a fly to these. The Icebreaker Men's Leggings with Fly are a simple, natural, high performance base layer. Icebreaker Merino wool is perfect for keeping New Zealand high mountain sheep comfortable and happy, insulating to warm them in the winter, and breathing and wicking to cool them in the summer; merino wool works like this for you too. The lightweight material has ultra fine fibers so it feels soft and won't itch, and it resists static electricity build up so it won't cling. Icebreaker merino wool also resists odor naturally so you can wear it for days or even weeks without washing it. For extra comfort, the Icebreaker Leggings with Fly are close fitting, have gussets for flexible mobility, and have no center back seam in order to avoid chafing.