The Patagonia Men's Sender Boxers are performance boxers made of moisture-wicking, recycled nylon/spandex mesh for high-output activities and travel. Fair Trade Certified™ sewn. First on, last off, our exceptional, moisture-wicking Sender Boxers provide an unsurpassed foundation for any active day. Made with a laser focus on materials, fit and support, the Sender Boxers have a moisture-wicking micromesh fabric of recycled nylon and spandex that feels airy and light, stretches when you move, wicks moisture and dries in a flash. We added an anti-roll, comfort waistband that stays put without pinching, binding or chafing, even when you’re running after the day’s last train. The bulk-free fit has ergonomic shaping and patterning to keep these boxers from riding up or bunching. Flatlock, chafe-free seaming throughout means all-day comfort under pack straps or harness. With a fully functioning fly. Sender Boxers are also Fair Trade Certified™ sewn, which means the people who made them earned a premium for their labor. Features and Specifications Made from moisture-wicking, recycled nylon/spandex stretch micromesh fabric for cool-wearing, quick-drying performance; with HeiQ® Fresh durable odor control Fully functioning fly Flatlock, chafe-free comfort seaming Bulk-free fit Anti-roll, comfort waistband Fair Trade Certified™ sewn 91 g (3.2 oz) Materials: 4.1-oz 89% recycled nylon/11% spandex mesh with a wicking finish and HeiQ® Fresh durable odor control. Fabric is certified as bluesign® approved. Fair Trade Certified™ sewn Size Chart Patagonia Pants Size Chart - Men's MEN XS S M L XL       XXL Waist 28 29 31-33 34-36 38-40 42-44 Inseam*  31 31 32 33 33 33 Patagonia Men's Sender Boxers Underwear