CHEETAK Cheetah Protective Boot for Hydro Flask Sport Water Bottle 12oz - 40oz, BPA Free Anti-Slip Bottom Silicone Sleeve Cover, Compatible with All Water Bottles with a Bottom Width of 2.87-3.56in

After reading some reviews I bought the smaller sized boot for my 40oz simple modern trek bottle. Because that water bottle is slimmer at the bottom to fit in car cup holders you need to get the smaller boot if you have that cup. The only issue I had was the clear boot turned yellow after one week. I returned it and bought a different color that wouldn’t fade !

Fits my Stanley and looks cute!

I bought both sizes because I couldn't measure my husband's 50 oz Trek and was hoping the larger one may fit. It doesn't. The 12-24 oz boot fits the 40 oz Simple Modern Trek perfectly and snuggly. There's a tiny lasered hole that allows the air to push out as you press it on so you don't struggle with it. Very easy to slide on and off. I will return the 32-40 oz boot because it's way too big for the 40 oz Trek and way to small for the 50 oz Trek and there's really nothing else around the house I can find to use it. The silicone seems durable and easy to clean. Best off all I don't hear or feel the metal setting down on any surfaces. Pictured is the clear colored boot on the almond birch colored Treks.

The media could not be loaded.  WHAT I PURCHASED: 12-24oz Clear/Transparent BootQuick version: It’s perfect and good price point. Serves it purpose and fits comfortably and snug on my Stanley 40oz cup. 10/10 recommend.Long version: I needed something to help protect my new Stanley from dents and dings on the base, the grip of the silicone also helps prevent knocking it over with a slight touch. I am a new Stanley cup user so my hydro flask always came with boots and I was worried this wouldn’t fit but it fit perfectly and now I have a boot AND don’t have a water bottle rolling around in my passengers seat (thanks to the cup holder fit) so if you have a 30/40oz Stanley or other after bottle designed to fit in a cup holder (ex. 12/24 oz bottles) I highly recommend this boot! From what I can see other people had great luck with color matching. I cannot attest to that being that I got the transparent color to match the transparency of the lid on my water bottle. I noticed this brand is a few dollars cheaper than some competitors so 10/10 once again! Highly recommend purchasing!! Especially if you’re someone who finds this much joy out of a water bottle like me haha (:

The boot fits my Stanley 40oz cup perfectly. With a little convincing I was able get the boot snuggly secured on the bottom of the cup. My only worry is the thickness of the boot. This one is not quite a thick and doesn't feel as sturdy as another brand I purchased. I worry I may tear it when putting on/ taking off the cup. It hasn't torn so far, but will update if it does.