In-shoe stability
Polyurethane Grip
A high-performance synthetic polymer engineered for durable, high-friction grip. It locks your foot to your shoe through micro-surface friction — and unlike adhesives, it keeps working even when wet — preventing the internal slippage that causes blisters and black toenails.
APP Tour pro Ryler DeHeart puts RTP UltraGrip Socks to the test on court.
In-Shoe Stability
Grip the court. Grip the racket. Never slip again.
Stop sliding. Prevent injuries
Dual-sided grip locks your foot to your shoe — even wet — so it can't slip and cause blisters or black toenails.
Shop the technology
Products built on this technology
UltraGrip Crew Socks
$37.99Product Highlight
Dual-sided non-slip pads
Moisture wicking instep mesh
Integrated arch band & cushioning
Targeted toe grip zones
The Material
What is Polyurethane?
Molecularly engineered
Can be precisely tuned soft or firm, flexible or supportive — polyurethane's properties are controllable at a molecular level, unlike basic foams.
Absorbs impact, resists deformation
Maintains its structure under repeated stress instead of permanently compressing over time.
Balances cushioning & control
A combination that's difficult to achieve with other materials — soft enough to cushion, firm enough to support.
Built for footwear consistency
Performs the same way rep after rep, session after session — where consistency matters as much as comfort.
Why It Works
Why Polyurethane Grip Technology Enhances Stability & Performance
Durable & resilient
Holds up under repeated friction and pressure, so grip doesn't wear down quickly like softer materials.
Locks the foot in place
A high-friction surface prevents unwanted movement inside the shoe — less energy loss, fewer blisters.
Flexible without compromise
Adapts naturally to foot motion while still holding strong grip properties.
Consistent in any condition
Lightweight and resistant to moisture and temperature changes, so performance doesn't drop off.
How It Grips
The Three Mechanisms of Polyurethane Grip
Micro-surface friction
Microscopic irregularities interlock with the insole — grips even smooth EVA foam or leather.
Elastic rebound
Compresses on push-off, then instantly rebounds — staying “sticky” against the insole instead of sliding.
Grip stays locked, wet or dry
Mechanical resistance, not adhesive tackiness — so grip holds even as sweat builds up.