Add sleeves to an outfit that doesn't have them, or has short sleeves! Cute way of making any t-shirt or short-sleeved beach dress warmer in the evening. Sleeves flare out slightly and have thumbholes, but are easy to push back and won't get in the way if that's not your jam. Bamboo. The color was sold as "lagoon," IIRC--a bright, cheerful, vivid blue not currently offered on their site. Final photo is of the fabric in direct sunlight for best idea of the color.