Sidi, a prominent name in cycling footwear, has introduced the HiemX, an MTB-specific shoe designed to excel in diverse weather conditions. This review delves into the construction, fit, ride experience, and overall value of these boots, particularly for riders in the UK who face variable weather. The HiemX stands out for its enhanced comfort, modern design, and robust build, aiming to overcome previous criticisms regarding Sidi's narrower fit. Tested over nine months, these shoes prove to be a reliable companion for cooler to mild temperatures, offering warmth, dryness, and efficient power transfer, positioning them as a strong contender for year-round off-road cycling.
Sidi HiemX: Detail Exploration
The Sidi HiemX cycling shoes, launched on January 12, 2026, by Neal Hunt, mark a significant evolution for the renowned Italian brand. Departing from Sidi's historically narrow shoe lasts, the HiemX adopts a new 'Millennium fit,' providing a wider and more accommodating toe box. This contemporary design incorporates earthy green tones with a matte finish, a refreshing change from traditional Sidi aesthetics. These ankle-high boots are meticulously constructed with a blend of reinforced textile, TPU, and a Gore-Tex ePE membrane. The membrane ensures waterproofness and breathability, complemented by a soft, fleece-lined interior that guarantees warmth for rides in autumn, winter, and spring. The boot's retention system features Sidi's high-density dial with Dyneema cables, offering a precise and secure fit that can be adjusted even with gloves on. The X2NC sole, a fusion of nylon and glass fiber, provides optimal stiffness for efficient power transfer while maintaining comfort, with an outsole designed for superior grip and replaceable toe caps. Weighing approximately 482g per shoe (size 44), the HiemX strikes a balance between lightweight design and durable protection. They are true to size, with insoles designed for medium arch support, although specialized insoles might be beneficial for those with distinct arch requirements. On the trails, the HiemX initially feels firm but quickly adapts to the foot, providing a snug yet comfortable experience. The high ankle and Velcro flap effectively seal out most mud and water, though a tighter ankle gaiter could enhance water resistance. These shoes maintain comfort and warmth in temperatures up to 12-14°C, performing exceptionally well in damp or frosty conditions, making them a versatile choice for diverse UK weather. Priced at £299.99 / $344.99, the Sidi HiemX positions itself as a premium offering, justified by its superior build quality, durability, and comprehensive performance across a wide range of temperatures.
From a cyclist's perspective, the Sidi HiemX represents a thoughtful response to evolving rider needs, particularly for those who prioritize comfort and weather protection without sacrificing performance. The move towards a wider fit is a welcome change, making these high-quality boots accessible to a broader audience. The integration of Gore-Tex technology and a fleece lining truly transforms cold and wet rides into more enjoyable experiences. While the price point is certainly a consideration, the versatility and durability of the HiemX suggest a long-term investment for passionate riders. These boots challenge the notion that winter cycling shoes must be bulky or uncomfortable, proving that elegance and functionality can coexist. For anyone who embraces year-round off-road adventures, the Sidi HiemX could indeed become an indispensable piece of gear, redefining expectations for all-season cycling footwear.