It’s not double walled. If you’re putting in cold liquids it will freeze your hands. It’s pretty though. 

The bottle doesn't have a complete seal, even when fully closed, leaks occur. Good quality material, lid is plastic, bottle looks to be aluminum. Light and durable.

Thought these shakers looked like a great plastic free option, however I was disappointed when they arrived. Where the product is advertised as 100% stainless steel, this only refers to the cup part of the shaker. The lid is mostly plastic with a metal ring around and what appears to be a silicone seal. This was a big let down for me as the main driver behind this purchase was because I thought I had found a plastic-free alternative (not to mention excessive plastic packaging). The product description or the product itself doesn't say whether it is dishwasher safe, however I can say after only a couple of goes in the dishwasher I would not recommend. The metal ring on the lid came completely loose after a single wash and the black coating started to peel away. Overall though, in terms of function, this shaker is as good as any. I like that the mixer is integrated into the lid rather than a ball, however this part would be very difficult to clean without a dishwasher. The shaker is also bigger than advertised, closer to 850ml capacity which I like.

Leaks very easily plus black paint coming off everywhere now looks sh!t

cool shaker although the black colour has started to come off already but it still works, it does its job

I love these metal shakers! I had the bule and silver one for many months and didn't matter if I forgot to clean it out straight away because it's metal! just boiling water and fairy liquid left over night and no horrible smells like you get with the free plastic ones you get when you bulk buy protein. I use the ball shaker what you get free from another shaker and I never get any lumps ect! Also yes It does leak a little but... I have it on the outside of my bag in a pocket made for a bottle/shaker! So it's always stood up! Much better than the plastic ones and will always get them! 👌🏼

Similar mixing issues like others have said. I use it for mixing the clear isolate protein with water and it mixes well. But if I make a milk based protein shake it doesn't mix as well. I have a bunch of metal mixing balls rolling around so I just use that when needed.

Who doesn't love a metal shaker, keeps the liquids colder for longer and does not leave a smell.

This looked great on the website sadly though, it doesn't mix well at all. Lumps throughout after a lot of shaking clumps sticking to the sides around the lip of the lid make it really messy to clean. Stick to standard plastic ones with a grid/ball. This is all about style over substance.

This shaker does not come with the metal shaker ball and instead has a plastic "grid" that's meant to help mix the protein. Even after shaking vigorously for a couple of minutes, protein is still gritty and chunky. I had to add in my metal ball from another shaker bottle to supplement the shaking action. Although it is pretty, I would not recommend this product just because it can't perform on its singular purpose in life.