Dual Lacing, Refined — Experience enhanced comfort and control with our signature TUNEDFIT™ Dual Lacing System. Now with two cinch cords per shoe, you can adjust the fit around the forefoot and midfoot independently in seconds. Paired with a wide toe box, it lets your toes splay, flex, and power through the longest runs in the toughest terrain.

Dries Fast, Built to Last — Crafted from a high-performance woven fabric and reinforced with aramid fibers that are five times stronger than steel, the T1’s upper is relentlessly durable. Its anti-siphon knit tongue repels water, ensuring a breathable, fast-drying design that thrives in the harshest conditions.

Midsole Mastery — LightCELL™, our proprietary PEBA-hybrid midsole, is turbocharged through supercritical foaming. LightCELL™ weighs just 50 percent of EVA while offering 45 percent greater energy return – it’s battle-tested by hundreds of ultrarunners for consistent responsiveness, mile after mile.

The T1’s outsole features a trio of Vibram® innovations: Megagrip rubber for tenacious traction in any condition, Litebase for 30 percent less weight without compromising performance, and Traction Lug micro-features for up to 25 percent more grip.

• Best For: Long-distance trail races. 
• Upgraded TUNEDFIT Dual Lacing System for separate lace adjustment.
• LightCELL midsole base featuring excellent lightness and bounce.
• Vibram Megagrip, Litebase, and Traction Lug technology.
• High-performance woven fabric upper reinforced with aramid fibers.
• Upper: High-performance woven fabric, DuPont™ Kevlar® fibers. 
• Lug Depth: 4mm. 
• Stability: Moderate. 
• Cushion: Plush.