Built to blare loud, and hold true to any of the users abuse, these whistles are the life saver to have on any adventure. Designed by search and rescue professionals Will not absorb moisture or freeze Works when soaking wet and clears instantly ABS plastic will not stick to mouth in cold weather as metal whistles do Double chambered for multiple pitches Waffled sure-grip Meets anti-choking standards for children Large tooth-grip for hands free use Lip-seal prevents loss of air in extreme cold World&';s most advanced all-purpose safety whistle Synthetic peas will not absorb moisture or freeze Split ring and heavy duty swivel snap included for easy attachment to garments or packs