2026 Castelli Thermoflex Arm Warmers (Fluo)

Castelli Thermoflex Arm Warmers — Built for Cold-Weather Performance

When temperatures drop but the race doesn't stop, the 2026 Castelli Thermoflex Arm Warmers keep you warm, comfortable, and fast. Engineered for cyclists and triathletes who refuse to let the cold slow them down.

• Warm and soft thermal fabric — Thermoflex material traps heat without bulk, keeping your arms warm from the gun to the finish line.
• Single-piece construction — Reduced seams mean less chafing and a cleaner, more aerodynamic fit under your kit.
• Silicone gripper at the top — Stays put mile after mile, no sliding, no adjusting mid-ride.
• High-visibility Fluo colorway — Be seen in low-light conditions during early morning training rides or late-season racing.

Pair with your QT2 race kit for a complete cold-weather system. Available in multiple sizes.