This Hutchwilco Pro-Spec 170N Auto Deck inflatable lifejacket features a built-in harness with ring for attachment of a safety tether life-line for use on yachts and other marine craft. The 170N inflated buoyancy is 13% greater than standard 150N jackets and the Interlock bladder design provides rapid rollover into the safe backwards position with mouth and nose clear of water. Inflation is automatic when immersed in water. A cushion soft neoprene gusset and mesh back makes the jacket very comfortable to wear for long periods without chaffing.