true to size. haven't used it enough to judge it.
My only observation was the elastic at the leg openings is restrictive for the size of my thighs. Otherwise, the jammer "works" for the casual swimming I do for exercise. The fabric is light but tough, not your typical spandex feel - silkier
Great jammer for the price. Ive had it for a few months and it has held up well. The only thing i don't like is the string is too short, it hard to double tie them.
Feels great, drys quickly, the only downfall of mine was that after one use it had started to un-thread in the crotch area. Maybe its just mine but I would rebuy these again.