This is the first 100% nylon swim brief that I've owned, and I love the comfort of the material. It's a very strong and sturdy fabric, fully double-lined, and quick-drying. It's not at all sheer or "see-through", but it's still a very lightweight suit. The fabric is very high-quality all-nylon material, and it's obviously a very well-constructed brief. I wear it for both swimming and water polo. The fit is really good on me, and it's very true to size. Basically it's a snug-fitting athletic suit, but not too overly tight for me. It's a great fit for water polo, and also for both training or competitive swimming. The 100% nylon fabric makes it extremely comfortable to wear almost anytime, and it never feels itchy or scratchy like most 100% polyester suits usually feel on me, and even some of the blended fabrics can be a little itchy for me sometimes. There's not very much stretch in this suit, which makes it a great performance brief, offering just the right amount of compression and support while holding everything in place. It fits exactly right for me now, but I'll probably outgrow it by next season. If you're unsure of what size to get, I would say to probably size up one size if you have thick legs or need extra room up front because the leg openings aren't very large and it's an overall rather snug fitting suit, including the front crotch area. If you have thinner legs like me and prefer a more athletic and snug fitting performance brief, then get the correct size from…