In terms of winterproof materials, Assos used the reliable two-layer twinDeck construction along the knees, thighs, crotch, and hips, made using a combination of ultralight 2L, membrane-equipped SPHERE Ultra backed by the more insulating brushed-back OSMOS Heavy. Out back they added thicker SPHERE Medium. This fortress of lab-developed waterproof and windproof fabrics ensures you receive targeted protection throughout, without ever compromising breathability.

For the insert, Assos incorporated the race-proven EQUIPE RS Insert - minus the kraterCooler ventilation holes - in the signature basalt colorway, equipped with superAir microShock foam, 3D waffle topsheet, and ASSOS-exclusive goldenGate technology.

• A-Lock Engineering: S9 system of textiles and technologies working in harmony to stabilize the shorts and secure the insert in place.
• OSMOS Heavy: This warp-knit is the main textile and the heaviest in the brushed Osmos family (290g/m2), featuring asymmetrical stretch and a soft, durable construction. High levels of insulation are derived from the brushed skin-facing side.
• SPHERE Ultra: Applied in twinDeck double-layer construction on the front crotch panel and in conjunction with OSMOS Heavy for added thermal insulation. A patented 2L windproof, waterproof, and highly breathable softshell constructed with a PU bonded membrane for added water-repellency - maximizing insulation while minimizing bulk. Weight: 140/m2; Breathability: MVP 40,000/m2/24h; Water Column: >10,000mm; Elasticity: 2-way stretch.
• SPHERE Medium: Used for the upper back panel, this is Assos' thickest version of SPHERE. It’s a patented 3L windproof and highly breathable woven softshell constructed with a PU bonded membrane for added water-repellency. Weight: 320/m2; Breathability: MVP 20,000/m2/24h; Water Column: >10,000mm; Elasticity: 4-way stretch.
• twinDeck: Double-layer fabric construction boosts insulation throughout the tights, used in a combination of OSMOS Heavy and SPHERE Ultra.
• blasenSchutz: An abdomen and crotch panel made with highly breathable, wind- and waterproof SPHERE Ultra material to increase comfort and warmth.
• rollBar: A patented bracing design that mimics a race car’s anti-sway bar by using the bib straps to stabilize the insert and lock it in place as your weight transfers from left to right while cornering.
• ergoBox: A square pattern construction that effectively frames the insert in the back, boxing it in for added stability.
• Carbon Xbib: A single section of elastic material - folded over on itself - forming a supportive A-frame that delivers limited vertical stretch in the rear. Above the “X” junction, a more flexible material is employed, incorporating an antibacterial carbon weave, to wick moisture and lay flat in the front.
• Taped Seams: Found the front panels, these increase the watertight properties of the tights.
• DWR: Treated with Durable Water Repellent treatment to add one more level of insurance against the elements.
• waterBarrier: Geoprene outermost layer at the bottom of the leg that repels water and adheres to booties.
• EQUIPE RS Winter Insert: Race-spec elastic interface insert in 3D basalt colorway, minus the kraterCooler ventilation holes in the front.
• kukuPenthouse: A soft OSMOS Heavy layer added to the front part of the insert that supports the male anatomy, eliminates pressure, and increases ventilation.
• superAir microShock foam: A lightweight open cell foam with a shock absorbing composition that returns to its original position, filling the gap every time pedaling position is changed in the saddle through the shift of weight.
• 3D waffle: A patented, three-layer perforated foam that increases breathability and eliminates excess weight.
• goldenGate: A patented technology that interrupts the stitching along both of the insert’s side panels, allowing a more three-dimensional freedom of movement in this sensitive, rotational area.
• Reflective Bands: Placed on the backs of the calves for added visibility.
• aeroFit: The trimmest, speed-focused fit that’s tighter and more compressive than the racingFit. May feel restrictive out of the riding position but feels like a second skin while riding.