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.