The 500ml Double Wall Insulated Fluid Bottle in Camo Grey by Avanti is constructed from durable, high-grade 18/8 stainless steel, for both the inside and outer walls, these reusable bottles are built to last. Featuring double wall Aircore Technology, the vacuum insulation maintains the internal temperature of the bottle and keeps drinks cold for up to 24 hours and hot for up to 12 hours regardless of the temperature outside. Condensation free, the leak-proof screw top lid with its silicone seal is airtight and eliminates accidental spills, so taking these bottles on the go is easy and mess free. Great for work, sport, in your car, at the beach or camping. Keep Hydrated all day long with these rippers.