Blue Life X REVOLVE Sweetheart Skimpy Bottom in Black. - size XS (also in ) Blue Life X REVOLVE Sweetheart Skimpy Bottom in Black. - size XS (also in ) 87% polyamide 13% lycra. Hand wash cold. Adjustable side straps. Ruched back detail. BLUE-WX339. 238 9486. You may have heard about the trendy Planet Blue boutique in Malibu and Beverly Hills, but did you know about the store's own brand, Blue Life? Comfy hoodies and tees that aren't your basic old pieces, with details that will have you coming back for more.