Lock & Lock bottle LHC4017 Colorful Tumbler - 304 stainless steel, PP plastic cap, BPA free, safe for health - The bottle is designed with 2 layers of high grade 304 stainless steel, now is foot insulation No, the inner layer is coated with special copper coating to keep the bottle extremely good, has high heat retention, keeps hot for 12 hours, stays cold up to 17 hours - Bottom fertilizer has anti-slip silicon layer - The lid has Silicon cushioning keeps the bottle completely tight no matter what position you put it in