ice gel pack vest 1. Reusable ,Non-toxic,Non-caustic. 2. FDA, SGS, MSDS,CE, etc approved 3. OEM welcomed ice gel pack vest ... 1.CE,SGS,EN71,FDA2.Non-toxic,non-caustic,reusable3 ... ,non-toxic,eco-friendly and reusable 4) put the inner ice pack in the refrigerator for about 12 hours