The redesigned Tek Sok delivers exceptional cooling and comfort in hot weather conditions. Coolcore's™ patented chemical-free cooling, moisture-wicking, moisture transportation and evaporation fabrics used in this neck gaiter are exactly what you need to keep cool and maximize performance. Unlike other cooling and sweat-wicking fabrics that rely on chemicals or polymer crystal treatments that degrade over time, the Tek Sok will deliver consistent cooling and wicking performance throughout the lifetime of the garment. Coolcore™ patented chemical-free cooling fabric. Four-way stretch. Non-abrasive flat-lock stitching for comfort. Stretch seams to avoid seam popping. Breathable, moisture-wicking fabric. Fast-drying. One size fits most.