closed cell foam 1.Anti-collision and heat insulation 2.Smooth Surface ... .no toxic.durable in water ,could filter air,dust Closed cell foam 1.Anti-collision and heat insulation2.Smooth Surface3.no ... .durable in water ,could filter air,dustClosed cell foam could stand some press ,closed cell .,10-60ppi ,good elasticiry ,no toxic. ... 6 UV- protection, environment , have passed SGS and AOV closed cell foam