Shatterproof glass: break resistant glass with special silicone coating prevents the bottles from exploding with harmful shards, safer for Children and Elderly 400°C Heat Resistance and 120°C thermal shock resistance. Good thermal stability and thermal shock performance, suitable for any kinds of beverage which might contain acid Compact design , suitable for sport, home and workplace Silicone coating with soft texture. anti-skid and scratch resistance Food Grade of silicone glass and material, BPA Free, tested and certified with FDA