bottlebottle Protective Silicone Sleeve Fit 12-64oz for Hydro Sports,Simple Modern,Takeya,MIRA, Iron Flask and Other Brand Water Bottle, BPA Free Anti-Slip Bottom Sleeve Cover

Bought the size that fits 24oz for our Iron Flask water bottles and it fits perfectly and stabilizes the bottles as I was hoping. Easy to put on. The colors looked nice with the bottles we have, as well. The thickness and quality is just right, while still allowing the bottle to fit in a standard cup holder and in the side pocket of a backpack. I'm planning to buy third for another water bottle.

FIT: POOR, please SEE PHOTOS** 40oz version: DOESN"T FIT - too rounded and too rigid to fit well on the bottle.** 18oz version: FITS PERFECTLY - shaped correctly.The transition between the sides and bottom of my Hydroflask 40oz Widemouth bottle is a relatively square angle, but THIS SLEEVE HAS A ROUNDED TRANSITION. please SEE PHOTO. the rounded transition from the bottom to sides of the sleeve make it impossible for the bottle to slide all the way down into the silicone sleeve. If I force it all the way on, the silicone is too rigid to stretch to fit the square bottom edge and the sleeve works itself off the bottom of the bottle just a little. That leaves this puffy air pocket under my water bottle at all times, which makes it every so slightly unstable when sitting on the counter.Materials: nice, soft / sturdy silicone, bright color. looks great, IF ONLY IT FIT CORRECTLY!!ADDENDUM: in response to the reviewer who suggested it was my application technique that caused the air bubble.I apply and remove the Bottlebottle 18oz sleeve and the Hydroflask-branded 40oz sleeve EVERY DAY when I wash my water bottles, and never have an issue with trapped air bubbles. I find that simply pushing firmly on the bottom of the sleeve during installation will evacuate any trapped air, and I haven't found "burping" necessary. Neither of my sleeves have "vent holes," and both can be used as doggie-dishes.The Hydroflask-branded version I ended up getting for my 40oz bottle is thinner (hence perhaps less protective?), is more flexible, fits more snugly, but most importantly IS SHAPED APPROPRIATELY AND DOESN'T PUSH ITSELF OFF THE BOTTOM OF MY WATER BOTTLE.

I purchased 2 of these silicone sleeves for our new Hydro Flask bottles - wide mouth 32 oz and 40oz.Sturdy, brightly colored - super easy to slip on and go on an adventure.bottlebottle Protective Silicone Sleeve Fit 12-64oz for Hydro