The Patagonia Calabash is a go-to summery tank with a racerback and a flowing silhouette. It's made from two fabrics: organic cotton/Tencel lyocell jersey in front and a textured slub knit in back. Deciding between poisson cru in Teahupoo or tacos in Todos Santos is tough. So was deciding between their favorite hot weather fabrics to make this tank - so Patagonia used both. A printed, organic cotton/Tencel lyocell in the front and textured slub knit for the racerback. With a loose fit and hip length, you might decide to wear this summery tank all season.