An almost weightless full-torso underlayer in Solenne's signature void-white, so fine it reads as a second skin under transparent or light-colored outwear. The nano-fiber weave is visibly iridescent at close range — faint blue-gold shift depending on light angle. Solenne's atelier mark is woven into the inner left hem in platinum thread, readable only by scanner or tactile inspection.

Designed for Spire-level clients whose environments move between climate-controlled towers, exposed skybridge transit, and pressurized event spaces. The layer maintains a 0.5-degree personal microclimate regardless of external conditions — imperceptible to others, absolute in effect.