5 mm neoprene.
The seams of the boots are waterproof due to GBS assembly (Glued and Blind Stitched): the neoprene is glued and then stitched for maximum resistance (the needle does not go all the way through the neoprene to prevent water getting through).
A latex sole: this increases comfort when walking, durability and, therefore, the lifespan of the product.
How to choose your size
Try them on with your fins. The fit should be as tight as possible.
These scuba diving boots provide thermal protection that has been tested by the independent INPP institute (Marseille, France) in order to validate their compliance with the current standard (EN 14225-1:2017)
I am a uk size 7 so I ordered online 40-41 but they are tiny! Half the size of my Birkenstock in length, very poor sizing and very disappointing as was hoping to use them this weekend but no time to change them so has ruined my scheduled swim.
Response of the brand
Thank you for your recent feedback. We are sorry to hear that size of our neoprene booties didn't fit properly. We will be very happy to exchange it for bigger size or provide full refund. Please visit your local store or use the online procedure to return this product.