Assos GT Ultraz Winter Booties EVO

Assos GT Ultraz Winter Booties EVO

The Assos GT Ultraz Winter Booties EVO are made for days when even hardcore road cyclists wonder whether they should head out. The two-layer twinDeck design combines the three-layer ThermoShell softshell with a sealed PU membrane, providing strong weather protection with high breathability. A DWR coating on the outer layer supports protection against spray and road grime without restricting mobility. The whole package is rounded off by the concealed Camlock zipper and the raw-edge zeroCuff finish for a clean transition to your tights and a sleek, aerodynamic profile.

• Two-layer twinDeck textile concept for extra insulation
• Three-layer ThermoShell with PU membrane and DWR finish
• Camlock zipper at the back for secure hold
• Raw-edge zeroCuff for seamless leg finish
• Grippy sportGrip sole for better hold when walking
• Colour: blackSeries (black), coordinated with Assos winter kits

Technical Details and Features

The heart of these overshoes is ThermoShell, a three-layer softshell material with PU membrane and perforated circular knit outer side that lets moisture escape while keeping you pleasantly warm. Assos uses the material in an overlapping, two-layer twinDeck construction, which noticeably increases insulation performance under cold, windy conditions. For additional protection, the surface is treated with a durable DWR coating that makes water bead off and reduces drying time. Details like the concealed Camlock zipper and the zeroCuff finish minimise edges, reduce air turbulence and make layering under winter tights easier. The underside uses sportGrip with one-way stretch to reduce slip risk when walking and improve durability in the cleat area. Composition according to manufacturer: Main fabric 95% polyester / 5% polyurethane, front section 65% polyester / 35% polyurethane.

Applications and Benefits

The GT Ultraz Winter Booties EVO show their strengths on long base rides, when commuting in the city and during winter training rounds on the road bike. Their focus is on high insulation and reliably weatherproof protection without resorting to stiff neoprene – this reduces volume, improves breathability and supports a natural pedalling feel. The zeroCuff finish ensures a clean transition to winter tights, while the Camlock zip makes opening and closing easier even with cold fingers. When dismounting, the sportGrip zones provide noticeable grip on wet surfaces around Lake Zurich or on salt-wet pavements. The overall slim construction promotes a smooth aero profile, which particularly pays off in windy weather on open sections in the Mittelland.

Fit and Compatibility

The booties are designed for road and performance-oriented shoes and allow enough freedom of movement in the ankle area for a smooth pedalling motion. Assos uses its familiar sizing system for accessories; choose the size to match your cycling shoes and preferred sock thickness so the twinDeck construction seals optimally. The rear zipper design makes it easier to put on over winter tights and keeps the instep area smooth and wrinkle-free. Thanks to the blackSeries colour, the overshoes integrate discreetly into existing winter outfits from Assos and other brands. Those seeking maximum warmth with minimal volume will find a balanced mix of insulation, protection and everyday practicality for Swiss winter days.