Estimated reading time: 12 minutes
Table of Contents
- Overview
- Full Specifications
- Construction & Materials
- On-Wall Performance
- Sizing Guide — UK
- PR23 vs The Competition
- Full Castiron Grip Lineup
- Who Is It For?
- Formerly Rock Planet
- Performance Velcro Climbing Shoes in the UK — 2026
- Shop the PR23
- Verdict & Rating
- FAQ
Overview
The Castiron Grip PR23 is the performance velcro climbing shoe in the Castiron Grip lineup — built specifically for UK sport climbers and boulderers who want precision footwork without the premium brand price tag. At £119, it delivers a precision rubber rand, asymmetric last, and dual velcro closure in a competition-capable package. International shipping available to the UK.
The PR23 is purpose-built for performance — aggressive asymmetric last for toe precision on small holds, dual velcro for quick transitions between routes, and a sticky rubber rand that grips limestone, gritstone, and indoor wall surfaces equally well.
Full Specifications
| Spec | Detail |
|---|---|
| UK Price | £119 |
| Closure | Dual Velcro |
| Last | Asymmetric, aggressive downturn |
| Rubber | Precision sticky rubber rand |
| Upper | Synthetic microfibre |
| Midsole | Semi-stiff board lasted |
| Gender | Unisex |
| Best For | Sport climbing, bouldering, indoor walls |
Construction & Materials
Asymmetric Last with Aggressive Downturn — Pulls the big toe into a power position for precision footwork on small edges and pockets. The aggressive downturn concentrates force through the big toe, giving you power on overhangs and precision on technical limestone and gritstone.
Dual Velcro Closure — Two velcro straps for a secure, adjustable fit. Quick on/off between routes — essential for bouldering sessions where you're constantly removing shoes between attempts. Compared to lace-up shoes like the Castiron Grip SWIFT, the PR23's velcro system trades micro-adjustability for speed.
Sticky Rubber Rand — High-friction rubber compound grips limestone, gritstone, sandstone, and indoor wall textures. Wraps around the toe box for smearing capability on slabs.
Semi-Stiff Board Last — Enough stiffness for edging on small footholds, with enough flex for smearing and heel hooks. The sweet spot for all-round sport climbing performance.
On-Wall Performance
- Edging — Semi-stiff board last transfers power to small footholds with precision
- Smearing — Sticky rubber rand wraps the toe box for slab and volume smearing
- Heel Hooks — Rubber heel cup provides grip on heel hook moves
- Toe Hooks — Rand rubber extends over the toe for toe hook contact
- Pocket Climbing — Asymmetric last concentrates power through the big toe for mono and two-finger pocket work on Peak District and Pembroke limestone
- Bouldering — Dual velcro for quick removal between attempts; aggressive enough for Font 7A+ and V7+ problems
Sizing Guide — UK
Due to the aggressive downturn, the PR23 runs small. Size up 0.5–1 EU from your street shoe size. The synthetic upper has minimal stretch compared to leather shoes.
| UK | EU | US Men's | US Women's |
|---|---|---|---|
| 2.5 | 35 | 3 | 5 |
| 3.5 | 36 | 4 | 5.5 |
| 4 | 37 | 4.5 | 6.5 |
| 5 | 38 | 5.5 | 7.5 |
| 6 | 39 | 6.5 | 8.5 |
| 6.5 | 40 | 7 | 9 |
| 7.5 | 41 | 8 | 10 |
| 8 | 42 | 9 | 11 |
| 9 | 43 | 10 | 12 |
| 9.5 | 44 | 11 | 13 |
Not sure on sizing? Email support@castironlift.com — we respond within 12 hours.
PR23 vs The Competition — UK 2026
| Feature | PR23 | La Sportiva Tarantulace | Scarpa Instinct VS |
|---|---|---|---|
| UK Price | £119 | £90–£110 | £140–£160 |
| Velcro Closure | ✅ Dual | ✅ Single | ✅ Dual |
| Asymmetric Last | ✅ Yes | ✅ Yes | ✅ Yes |
| Aggressive Downturn | ✅ Yes | ❌ Moderate | ✅ Yes |
| Sticky Rubber Rand | ✅ Yes | ✅ Yes | ✅ Yes |
| Free UK Shipping | ✅ Over £150 | Varies | Varies |
Full Castiron Grip Lineup — Which Model Is Right for You?
| Model | Closure | Downturn | Best For | Level |
|---|---|---|---|---|
| PR23 (this shoe) | Dual Velcro | Aggressive | Bouldering, overhangs, sport climbing | Advanced |
| N23 | Dual Velcro | Moderate–Aggressive | Precision edging, sport climbing | Intermediate–Advanced |
| SWIFT | Lace-Up | Moderate | All-round, sport climbing | Beginner–Intermediate |
| ONE | Velcro | Flat | Youth development | Youth |
| HUG | Velcro | Flat | Kids first shoe | Kids Beginner |
| Little ALIEN | Slip-On | Flat | Kids beginner, slip-on | Kids Beginner |
Who Is the PR23 For?
- ✅ UK sport climbers — British Climbing and BMC affiliated climbers
- ✅ Boulderers — dual velcro for quick removal between attempts at Font, Peak District, or your local wall
- ✅ Intermediate to advanced climbers — Font 6C+ and above, 7a+ on routes
- ✅ Indoor wall regulars — sticky rubber performs on all commercial wall surfaces
- ✅ Outdoor sport climbers — limestone, gritstone, and sandstone performance
Formerly Rock Planet — Now Castiron Standard
The PR23 was formerly available under the Rock Planet brand — same construction, same last, same proven rubber compound. Rock Planet built a strong reputation in the UK climbing community for accessible performance footwear, and that DNA carries directly into the Castiron Grip line. If you climbed in Rock Planet shoes, you already know what the PR23 delivers.
The Castiron Grip line represents the next chapter: unified brand standards, expanded sizing, and a next-generation model lineup arriving in 2027. The PR23 is the current generation — and it's the same shoe that earned Rock Planet its reputation in the UK market.
Performance Velcro Climbing Shoes in the UK — 2026
The UK climbing shoe market is dominated by La Sportiva, Scarpa, and Five Ten — all European or American brands with UK retail markups that push performance velcro shoes to £140–£180. For UK climbers affiliated with British Climbing or training through BMC clubs, the cost of quality footwear is a genuine barrier to progression. The Castiron Grip PR23 enters the UK market at £119 — dual velcro, asymmetric last, sticky rubber rand — with international shipping direct to your door.
For UK climbers who train at commercial walls like The Climbing Works, Depot, or Boulderworld, the PR23's sticky rubber compound performs equally well on Kilter Board, Moonboard, and spray wall textures. The dual velcro closure means you're not fumbling with laces between attempts — critical when you're projecting a problem and need to rest your feet between burns. The aggressive downturn gives you the power position needed for the steep terrain that defines modern indoor bouldering, while the semi-stiff board last provides enough edging precision for the technical footwork that UK limestone and gritstone demand.
UK climbers ordering the PR23 benefit from international shipping with free delivery on orders over £150. At £119, combine with chalk, a brush, or another Castiron Grip accessory to hit the free shipping threshold. Standard international shipping to the UK typically arrives in 5–8 business days.
Shop the Castiron Grip PR23
PR23 — Performance Velcro Climbing Shoe
£119 · Dual Velcro · Aggressive Downturn · Sticky Rubber · International shipping · Free over £150
Shop PR23 — £119 →Verdict & Rating
Overall: ⭐⭐⭐⭐⭐ 4.7/5
- Edging Performance: 4.5/5
- Smearing: 4.5/5
- Bouldering Versatility: 5/5
- Value for Money (UK): 5/5
- Comfort Out of Box: 4/5 (aggressive downturn — size up 0.5–1 EU)
The Castiron Grip PR23 is the best performance velcro climbing shoe under £120 for UK climbers in 2026. Dual velcro closure, aggressive asymmetric downturn, sticky rubber rand — everything you need to progress from intermediate to advanced climbing without paying La Sportiva Solution Comp or Scarpa Instinct VS prices. The best value performance velcro shoe in the UK market.
Frequently Asked Questions
Are the PR23 suitable for UK outdoor climbing?
Yes — the sticky rubber rand performs well on UK limestone (Malham, Gordale), gritstone (Peak District, Yorkshire), and sandstone (Fontainebleau-style). The aggressive asymmetric downturn gives you the toe precision and power needed for technical UK sport routes and hard bouldering problems.
How does the PR23 compare to La Sportiva Tarantulace for UK climbers?
The PR23 offers dual velcro vs the Tarantulace's single strap, an aggressive downturn for better performance on steep terrain, and comparable rubber quality — at a similar or lower price point. For UK climbers who boulder regularly and need a more aggressive shoe, the PR23 is the stronger choice.
Do the PR23 run small?
Yes — due to the aggressive downturn, size up 0.5–1 EU from your street shoe size. The synthetic microfibre upper has minimal stretch, so err on the side of sizing up if you're between sizes.
How long does international shipping to the UK take?
Standard international shipping to the UK typically arrives in 5–8 business days. Expedited shipping (2–4 business days) is available at checkout. Free shipping on orders over £150.
Are the PR23 approved for British Climbing competitions?
The PR23 meets standard climbing shoe specifications for British Climbing and BMC affiliated competitions. Always verify current equipment rules with your specific competition organiser.
Can I use the PR23 for lead climbing as well as bouldering?
Yes — the PR23 is versatile enough for both lead sport climbing and bouldering. The aggressive downturn makes it particularly well-suited to steep bouldering and overhanging sport routes. For more moderate terrain and all-day comfort, consider the N23 or SWIFT instead.
External Resources
- British Climbing — Official Federation
- BMC — British Mountaineering Council
- BMC Wall Finder — Find Your Local Climbing Wall
- UKClimbing — UK Climbing News & Reviews
- 99Boulders — Climbing Shoe Reviews
📚 More from the Castiron Grip Climbing Reviews Hub:
Castiron Grip Climbing Shoes Review 2026 — UK Hub →
Written by T-K