FITS PERFECTLY - Our silicone boot is designed to perfectly fit: Stanley Tumblers: Adventure Quencher (20oz, 30oz, 40oz), H2.0 FlowState (30oz, 40oz with handle), IceFlow (20oz, 30oz). Hydro Flask: Water Bottles (12oz, 16oz, 18oz, 20oz, 21oz, 24oz) & Travel Tumblers (35oz, 40oz). Simple Modern: Tumblers (30oz, 40oz), Classic (20oz, 24oz, 28oz), Summit (14oz, 18oz, 22oz), Ascent (20oz, 24oz). EXTENDED COMPATIBILITY - Also fits other popular brands like: Owala: 40oz Stainless Steel Tumbler. YETI: Rambler Travel Mug & Tumbler (20oz, 30oz), Water Bottles (12oz, 18oz, 26oz). Compatible with tumblers or bottles with a base diameter of 2.8-3 inches (7.1-7.6cm). HIGH-QUALITY MATERIAL - Made of food-grade silicone, BPA-free, safe for kids and pets. Soft, durable, and elastic—won’t deform or crack. Easy to clean and reusable. Perfect for on-the-go use, even as a dog bowl. MAXIMUM PROTECTION - Shields your tumbler or bottle from dents, scratches, and damage. Extends the life of your favorite drinkware. The ultimate accessory for an active, on-the-go lifestyle. BETTER SERVICE - For any questions, contact us. We’ll respond within 10 minutes during working hours. Diamond Silicone Boot for Hydroflask Water Bottle