Designed to keep most unconscious wearers face-up. Reversible for quick donning, SOLAS grade reflective material, stainless steel hardware. Merchant Mate I, model I100 is USCG Approved Type I and features 22 lbs. (98 Newtons) of buoyancy. Ocean Mate I is USCG & SOLAS approved. Ocean Mate MED- complies with SOLAS only. Ocean Mate I features 35 lbs. (150 Newtons) buoyancy and includes whistle. (MED style not reversible) Also available in youth size.