Premium 500ml stainless steel thermal flask with double-wall vacuum insulation for 12-hour temperature retention. Matte rubber paint exterior provides scratch-resistant durability and a comfortable non-slip grip. Precision small mouth design prevents spills while maintaining optimal drinking flow. Food-grade 304 stainless steel interior resists odors and corrosion. Ideal for outdoor adventures, office use, gym hydration, and travel. Ergonomic size fits standard cup holders. Seamless one-piece construction eliminates leakage risk. BPA-free materials ensure safe drinking. Commercial-grade durability for bulk hospitality or corporate gifting. Custom logo printing available for wholesale orders.