Sell Hat Covers

when the human body is perspiring,the sweat can be completely passed through, human's skin can obtain the natural breath The TPU membrane has a super density,cellular shaped molecular structure,which contains as many as 9 trillion microspores in a mere 1 sq.inch.The diameter of such hole is only 0.1-0.3μ,while that of water is 100-300μ,that si 1000 times larger than the microspore,so the water molecular can't come through it,but the diameter of water vapor is only 0.00004μ,therefore,the water vapor(or sweat vapor)can come out easily.

Sell Hat Covers