CAYL ALPHA JACKET HBX (Hypebeast)& CAYL Light Air Cap Black Wallace Mercantile Shop [] CAYL() Aquax Cap fazeone CAYL Grey Thermo Jacket, $260 SSENSE Lookastic CAYL Alpha Flap Cap White Outsiders Store UK. The Alpha Cap from CAYL is a performance cap designed for those baltic winter morning excursions. Equally adept when deployed for running, climbing or rambling, the five panel style utilises Polartec Alpha fleece for enhanced heat retention, and features foldable earflaps to further enhance those heat hoarding credentials.