The Mount Defiance Long Sleeve Knit - Plus from Columbia is sure to be your new favorite layering piece, born to accommodate larger and taller frames. The flat lock seam design keeps you chafe free during strenuous activity and Columbia's Omni-Wick moisture wicking, quick dry technology ensures you'll stay dry and comfortable lap after lap. UPF 50 sun protection allows you to wear it stand alone on those bluebird days so you can spend more time on the slopes. The Mount Defiance Long Sleeve Knit-Plus comes from Columbia's Titanium Collection, which holds only their very best gear so you can perform at your very best as well! Omni-Shade UPF 50 Sun Protection. Omni-Wick Technology. Flatlocked Construction. Part of Columbia's Titanium Collection.