The cup is double wall vacuum insulation

without worrying about any mess at work

the vent on the lid allows the fast flow of water with effortless drinking

no breakage

Lightweight Even Durable: The bottle wall reduces 25% weight totally by rotating technology without affecting the firmness of the thermo flask

SwivelSip™，Wide Mouth Straw 3.0 Bottle，40OZ /1200ML Color:Mango The cup is double wallErgonomic Design: Features a flip open straw and soft grip ergonomic handle for comfortable carrying and effortless sipping on the go. Ideal as a drinks bottle or flask for travel, gym, or daily use. Double Wall Insulation: Made from premium 18 8 stainless steel, free from BPA, this insulated water bottle features double wall insulation for superior temperature retention, ensuring your beverages stay hot for 6 hours or cold for 12 hours. Wide Mouth