Thank you for viewing! GU Sleeveless Dress 100% cotton with a gauze-like feel. The fabric is thin, but it's not see-through, so you can wear it coolly. The waist has elastic. The skirt part has a lining, giving it volume. I don't think sweat stains will show. It's a blue floral design, sleeveless long dress with an elastic waist. - Design: Floral - Color: Blue系 (Blue-based) - Style: Sleeveless - Waist: Elastic - Length: Long Thank you.