We'll be among the first to acknowledge that the cycling industry can often fall victim to its own marketing hype. Castelli promises to play it straight with the Chill Arm Sleeves, freely disclosing that the cool tingling of the Xylitol incorporated in the sleeves' Prosecco Ice material is actually just a placebo. The cooling effect of the Chill Arm Sleeves — as with all similar articles — comes from good ol' evaporation.
While the sleeves don't actually make you cooler on their own, they do help you monitor your heat with Castelli branding that disappears as it heats up. This serves as an alert every bit as tangible as your heart rate monitor that it's time to wet the sleeves. Their construction is meant to absorb and hold water, prolonging the effects of cooling evaporation. A UPF of 50 provides one more anti-sun benefit on days when you'll really appreciate the reminder to keep your cool.
- Prosecco Ice Material
- Xylitol infused threads
- Logos disappear as you heat up