Sabelt base layers are broken into two categories, Club and Pro. The Sabelt UI100 is our Club series with 50% Nomex and 50% Viscose. The UI500 is Pro with a unique proprietary blend of Lenzing FR, modacrylic and elasthane are used to create a two way stretch wrap knit fit that keeps your Sabelt base layer underwear comfortable, snug and in place during the longest endurance races.
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