Castiron Grip N23 — Precision Edge Climbing Shoe

Castiron Grip N23 — Precision Edge Climbing Shoe

Aggressive downturn. Dual strap. High-friction rubber. The N23 was built for climbers who need their shoe to do exactly what they tell it — nothing more, nothing less. Precision edging on vertical faces. Secure lockdown on overhangs. This is a performance climbing shoe that reads the wall before you commit. One standard. Every send.

The N23 doesn't negotiate with the wall — it reads it. The moderate-aggressive downturn positions your toe precisely on small edges and pockets without the discomfort of a full competition shoe. The dual velcro closure locks your foot in place between problems. The high-friction rubber compound holds on slab, vertical, and overhang alike. Built for V3–V7 bouldering and 5.10–5.12 sport climbing. Formerly Rock Planet N23 — same production, same performance. Castiron standard.

Key Specifications

• Style: Precision edge climbing shoe
• Closure: Dual velcro strap — fast, secure, adjustable between problems
• Sole: High-friction rubber — precision edging and heel hooking
• Toe Box: Moderate-aggressive downturn — more than beginner, less than competition
• Upper: Synthetic microfiber — Pink / Grey / Yellow
• Colors: Pink · Red
• Sizes: EU 35–44 | US Women 5–13W | US Men 3–11M | UK 2.5–9.5
• Best For: Indoor bouldering, overhang climbing, precision edging, intermediate to advanced climbers

Size Guide

Runs small due to aggressive downturn. Size up 0.5–1 EU from your normal size. Women size up 1.5 from men's US sizing.

Why the N23?

The N23 sits in the sweet spot between beginner comfort and competition aggression. Enough downturn to perform on overhangs and pockets. Enough comfort to wear through a full bouldering session. The dual velcro closure means you're back on the wall in seconds. The high-friction rubber holds where other shoes slip. For climbers pushing into intermediate and advanced grades who need a shoe that keeps pace — this is it. One standard. Every send.

Best For

• Indoor bouldering and overhang climbing
• Precision edging on vertical and technical routes
• V3–V7 bouldering and 5.10–5.12 sport climbing
• Intermediate climbers stepping up their performance

Also in the Castiron Grip Line

• PR23 — flagship performance velcro, EU 35–44
• SWIFT — all-round lace-up, EU 35–44
• Little ALIEN — beginner slip-on, EU 29–35
• ONE — youth velcro, EU 28–35
• HUG — kids beginner, EU 25–32