一、 The main purpose and scope of application
Applicable international ocean and inland water use all kinds of staff, rafting, flood control, water sports wear protection, also USES when firefighters fighting and emergency rescue.
二、 The main parameters
1. Execution standard: GB4303-84 standard requirement
3. Floating material: polyethylene foam (soaked in water for 24 hours after the buoyancy loss should be less than 5%)
4. Float state: to maintain the body vertical or back, head above the water.