I read the comments and thought I’d say something important that no one has mentioned.
small pebbles from the beach get stuck in the holes and only come out with a screwdriver... you come home with a souvenir from your vacation.. otherwise it is the best purely swimming flip-flop ever for summer - beach - pool, it never slips!!!
As for durability, I won’t even discuss it, they only get ruined if your dog eats them. Take the same size as your shoe.

Very good, although a little hard, which combined with the strongly anatomical design of the sole means they need a little time for someone to get used to them; if we leave that aside, then the fact that they don’t slip and fit perfectly on the feet makes them ideal for the beach or the home.
I use them at home and I highly recommend them!!!

se le usate in casa mettete le calze potrebbero sudarvi i piedi, in ogni caso avrete un ottimo grip dentro e fuori dalla ciabatta. Riparano bene i piedi mentre cammini, ottime in piscina

They are only recommended for the swimming pool. If you want them for outside or inside the house, I would say forget it - they are not comfortable on the foot, especially without a sock.

Amazing slippers worthy of the brand at a very good price at €12 for Arena! In a sports store, you might find the exact same ones for €32-35! Crazy! Just pay attention to the size, guys! Fortunately, I listened to the advice from previous users' reviews and they were right! I normally wear 42 and I went 2 sizes down and they fit me perfectly!

It is easily eaten from below but it does not slip
I am a lifeguard and I can run comfortably
even on wet tiles

Awesome. They don’t slip easily, very durable, they lasted their service normally. Size 44 is about 29.5 cm internally, measured with a tape measure.

I wear them at the swimming pool on a daily basis, they are brand new, they don't get damaged at all

They fit perfectly on the foot, they don't slip, they are very light and soft

They may not be particularly attractive but they hug the foot well. They maintain good grip on the floor and do not slip. Also, they have water drainage holes.

there is no better slipper for me. I have been buying the same one every year for 5 years and I wear it all summer. I get it one size smaller because after a while with constant use the sole flattens out and fits your foot. if you get it in your size, at first it will be fine but later it will be a bit loose.

It fits very tightly on the foot and does not make it comfortable for everyday use at home. But on the other hand, it is perfect for use in water, pool, sea, shower since they do not slip at all and stick to the foot like a suction cup.

Very good slipper, I had it and my boyfriend kept stealing it from me, so I got him his own and he wears them every day inside the house

In the blue color that I bought last year, they were flawless. Mainly in the sole, which interests me above all. In the black color that I got this year, they are not as good. The soles seem thinner to me. But very durable and they don't slip at all!!!! Tested on beaches with pebbles and rocks.

The previous model (Hydrosoft hook) personally suited me better due to problems I have with my foot sole. It had a more comfortable step and was the only pair of slippers among all I had tried where I didn’t feel pain. The difference that didn’t suit me is that in this model the back part is higher. From the previous model, I must have bought 5 pairs until I wore them out and then wore the next one. So with this, the new model, I immediately noticed the difference in the step. Of course, for someone who doesn’t have a problem with their feet, these will also seem just fine for walking

The new Arena Hydrosoft has been on the market for one to two years now and I believe it doesn't have the same feel as the previous one, plus it is wider and shorter in size. It is still early for a review and I will come back in the future for a new evaluation.

Guaranteed, the slippers from arena. Lightweight and durable. I had the previous ones for 10 years and they still hold up.

For the money I bought them, they are not worth it (now they are -30%), as they are made of the same quality plastic as the €5 ones!

I was also influenced by a review that described them as "tight" and ordered a size larger, which, as it turned out, is the correct size, so it is one size larger.

Very slippery both on the foot and on the floor.

As it finally turned out, it is yet another overpriced brand!

Maybe some other comments overly praise the water pumping slippers. They are very good slippers with a perfect fit, they do not slip at all.

Lightweight and stable.
They could be a little softer.
Be careful because the upper part is fixed (not adjustable with Velcro, for example), making it difficult to put on easily, and due to the material, it doesn't seem like they will "open up" to be more comfortable.

Lightweight, stable, not tight in the front, and they fit the same standard size as the shoes I wear. They are specialized for pools as I noticed that they have four holes in the heel and two in the front, just before the toes, for water drainage when you come out of the pool or bath. Of course, I don't know if these holes will collect dust or dirt when walking on the road or in the house yard.