My son has had issues with his swim trunks rubbing his legs raw for a few years now. We tried these this summer and he has had zero complaints! His legs no longer are raw and we aren't dealing with open skin and pain after a few days of swimming. Highly recommend this productfits great - nice qualityEs la talla exacta , consejo no compres talla más grande queda Perfecto talla exactaI will never buy another pair of regular boys swimming trunks again nor do I think my son would want me to neither! If I could I would personally think the person who first invented swimming trunks with a compression liner. No uncomfortable sand gets caught in it nor is it brought home to make a mess in my shower or my washing machine.If you’re looking for swimming trunks for a boy Get these I promise you won’t regret it!My son is an average size 10-year-old whom wears size 10/12 bottoms & these size 10/12 fit him perfectlyThese fit well and the long liner really helps ease of movement stops ride up and prevents chafing. Worth the money.bought this for my grandson because he complained of inner thigh chafing with his bathing suit. this worked .perfectly and solved the problem. i did expect the lining to be spandex, but it is not. its the same fabric as the bathing suit