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Smartwool has improved the fit of the M CLASSIC ALL-SEASON MERINO BL BB all-season men's underpants, making them even more functional and better looking. Ultrafine Merino wool helps regulate body temperature, it is breathable and naturally odour resistant. What more could you want from a base layer? So how about smooth flat seams to help minimize chafing and blisters, with a wide fabric-covered waistband? Thanks to Core Spun technology, the Merino wool is wrapped around a nylon core, so you can still enjoy the feel of soft Merino wool on your skin, but the nylon makes the fabric extra durable. That's all you need to set off on an adventure at any time.