Elite performance bicyclists wear this merino wool base layer, so we are confident it will keep you cool in summer and warm in winter as you ride to work or the grocery store. A good base layer helps regulate body temperature, whatever the weather, wicks moisture, and provides a vital aid to performance. Raphas Merino under layer is extremely odor resistant and can be worn under a business suit or casually for a weekend ride. The base layers are close fitting and cut long at the back for a better fit on the bike. All the seams have flatlock stitching so they wont chafe and are positioned behind the shoulders to avoid bag or bib straps rubbing while cycling.