Aero Calf Size:XS/S Intended for use with Butterfly

Intended for use with Butterfly Free Chack (the Butterfly Remover is not guaranteed to work on all rubbers)

Automatic Stroke Detection: Automatically detects and tracks stroke and rest periods—no buttons required

Comfortable carrying strap for easy transport

MyWhoosh and more

Aero Calf Size:XS/S Intended for use with ButterflyAvailable Spring 2026 Developed in collaboration with our elite triathletes, the Aero Calf Sleeves are designed with aerodynamic, thin and comfortable fabric for optimal performance. With a non compression silicone grip at the top, they stay securely in place under a wetsuit during the swim leg and seamlessly transition to the bike leg. Aerodynamic: Its smooth, thin fabric offers exceptional comfort. Composition: Elastane (Spandex): 20 %, Polyester :