These board shorts seem to be good quality, but my son hasn't worn them yet. I ordered him a large, which is what he wears in regular shorts - and they seem to fit well. The liner is the usual mesh, but it extends down the legs further - from a previous review I knew the liner was longer, but I was hoping it was made out of something better, not mesh.... I always have to cut any mesh liner out of my son's swim trunks; he wears an UnderArmour underwear type of liner (smooth & form-fitting) - the extra length keeps the wet swim trunks from rubbing against his legs and chafing.
according to my 11 year old son, this is the most comfortable suit around. the liner extends through the bottom of the shorts, so it doesn't irritate his skin. He loves it so much, he asked for more for christmas!