Groundz Women’s BIOS Sneakers are barefoot grounding lifestyle shoes designed for natural movement, lightweight comfort, and everyday versatility. The roomy toe box allows natural toe splay, while the zero-drop, no-toe-spring platform keeps the heel and forefoot level. A thin, flexible cup sole provides ground feel for walking, workouts, work, travel, and active all-day wear. Direct GroundSync™ technology uses proprietary conductive carbonized-rubber pads molded into the outsole. The upper combines premium metal-free natural nubuck on the quarter, tongue, and overlays with a breathable knit vamp made from 65% RPET, 31% wool, and 4% nylon hotmelt. Interior materials include metal-free leather, bamboo fiber, and a footbed with 5% stainless-steel conductive thread. The insole combines castor-bean-oil-based foam with a naturally antibacterial cork top layer. The outsole contains 48% natural rubber, 42% recyclable synthetic rubber, and 10% additives. Laces are made from 100% RPET recycled plastic bottles. Sole thickness is 5 mm with a 7 mm stack height. Each shoe weighs approximately 232 g in women’s US 7.5/EU 38.