First of all, it's not just for rollers as the description on Skroutz says; it's for all vehicles that kids usually ride and race around like crazy. Scooters, bikes, etc. Good product, it does what you buy it for, it protects children's limbs from falls and the bad hits that usually happen there (elbows, knees, wrists). However, I deduct one star because the kids complain that they get very hot wearing them, the material is synthetic and doesn't help, so their purpose is automatically canceled since they end up not wearing them at all. In summer conditions, they are not easy to wear in terms of comfort, they cause discomfort according to the kids, they start wearing them for about 20 minutes and then take them off soaked in sweat. There's also a process to put them on, it takes some time, but that's understandable, that's how these things are. However, the material should be cooler on the inside. The outside with the hard protectors is just fine. The price of 20 euros per set is excessive in my opinion for these materials, but we bought them because safety comes first. It's a pity though that they don't wear them because of the very hot materials.