DarkRX Sleep Mask3D contoured shell zero pressure on eyes, full blackout from any light source Blocks the light signals that cut your sleep cycles short protects the deep sleep window where disc rehydration actually happens Pairs directly with the NightRX pillow positional recovery + sleep quality, handled together Adjustable strap, 100g you won't feel it's there, your nervous system will Deep sleep isn't a luxury during comeback. It's when the repair happens.