4Pack Silicone Boot for Stanley 40oz Quencher Adventure & Stanley IceFlow 30oz 20oz, Reduces Noise Scratches Protective Cup Bottom Sleeve Cover Compatible with Stanley Cup Accessories (Transparent)

I really didn’t need 4, but I figured I would have extras to share with friends and family. These seem to fit my 20 oz travel mugs too, something my husband had to try. I really like these for protecting the bottom of my Stanley mugs and I definitely appreciate the mug not clanking every time I set it down! Great accessory for the Stanley mugs!

So glad someone thought to make these. These were inexpensive, 2/$5-6. They are opaque, goes with any color tumbler. fits 3" bottom tumbler. (Mine are 40 oz and 44 oz). I work with a moving table, and this keeps the cup ON the table. the cup also doesn't make a sound when i set it down. Love these, will order again.

Works for both 30 and 40 oz tumblers

Love the snug nice fit it has on my Stanley Cups!

I like that these are well priced, w/ 4 to a pack (altho being able to buy 2 for half the price would've been even better). They fit well on water bottles a little <3" diameter, & are easy to put on, even w/o a hole in the center (which should also keep them cleaner). The boot makes it quieter to set down the bottle, & will no doubt protect it from dings. They look nice, however they are more white than clear; you don't see the bottle color through them. That said, the ones labeled "White" are probably even brighter white & less transluscent. At any rate, I'm happy with them, just wish they didn't hide the bottle color/design.

I love this product. It stays on my 40oz hydroflask tumblr perfectly and looks so cute. I stick the tumbler in my car cup holder and was afraid this boot would come off when I take it out but that's not the case at all. It stays on and does its job while looking great on my hydro.

I love my Swell bottles, but the paint is always chipping on the bottom after awhile. I saw these on Amazon and knew I had to get them to protect my new 30 oz mug from suffering the same fate as my other bottles. They fit fantastic, wash up easily and really protect the mug bottom from any damage. Also, makes it a lot quieter to set down. Very inexpensive too.

I have a steel cup (and glass tables, marble & ceramic absorbing coasters) and it's kind of noisy ... Checked the sizes of cups and this and I know silicone has flexible fit ... it all worked out perfect. I also put one on my metal can koozie too. I probably didn't need to port them on but I like the idea of protecting surfaces of cups and table. Easy enough to take on and off for cleaning. They look nice.