lateral stability wings prevent excessive sideways motion

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 T1s 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 its battle-tested by hundreds of ultrarunners for consistent responsiveness, mile after mile.

The T1s 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.

Crash pad systems smooth heel to toe transitions efficiently