Estimated reading time: 12 minutes
Quick Answer: The Castiron Grip PR23, N23, and SWIFT are all built with fully synthetic uppers — no leather, no animal-derived materials. All three are vegan climbing shoes suitable for gym, sport, and multi-pitch climbing. Free shipping on qualifying US and Canada orders.
Contents
- What makes a climbing shoe vegan
- Synthetic vs leather in climbing shoes
- Castiron Grip vegan models
- Model comparison table
- PR23 — performance vegan option
- SWIFT — all-round vegan option
- N23 — entry-level vegan option
- How synthetic performs vs leather
- Caring for synthetic climbing shoes
- FAQ
- USA and Canada climbing resources
What Makes a Climbing Shoe Vegan
A vegan climbing shoe uses no animal-derived materials anywhere in its construction. In conventional climbing shoes, the most common animal-derived material is leather — used for the upper, lining, or both. Leather provides stretch characteristics that synthetic materials historically struggled to match, which is why it dominated climbing shoe construction for decades.
Modern synthetic microfibers have largely closed that gap. Today's high-quality synthetic uppers offer comparable fit precision, acceptable stretch behavior, and in some respects better performance than leather — particularly for climbers who want a consistent fit from session one without a prolonged break-in period.
A fully vegan climbing shoe will use synthetic microfiber or similar man-made materials for the upper, a synthetic lining (or no lining), and rubber compounds and adhesives that contain no animal products. The Castiron Grip adult line — PR23, N23, and SWIFT — meets this standard.
Synthetic vs Leather in Climbing Shoes
| Property | Synthetic | Leather |
|---|---|---|
| Break-in period | Minimal — fits well from session one | Longer — stretches and molds over time |
| Stretch | Low — size stays consistent | Higher — can stretch up to a half size |
| Breathability | Varies by construction | Generally higher |
| Odor resistance | Better — less bacterial absorption | Can retain odor over time |
| Sizing consistency | High — predictable fit | Lower — account for stretch when sizing |
| Vegan | Yes | No |
Castiron Grip Vegan Models
| Model | Price (USD) | Closure | Profile | Best for |
|---|---|---|---|---|
| PR23 | $109 | Single velcro | Aggressive | Advanced sport, steep routes, overhangs |
| SWIFT | $109 | Lace-up | Moderate | All-round, slab, multi-pitch, gym |
| N23 | $99 | Dual velcro | Moderate downturn | Gym, sport climbing, beginner to intermediate |
PR23 — Performance Vegan Climbing Shoe
The PR23 is Castiron Grip's performance-tier shoe — aggressive downturn, single velcro closure, low volume, and a fully synthetic upper. For climbers who want maximum performance on steep sport routes, overhangs, and technical face climbing without using animal-derived materials, the PR23 is the top-of-range vegan option in the line.
- Price: $109 USD
- Closure: Single velcro
- Profile: Aggressive downturn
- Volume: Low
- Upper: Fully synthetic — no animal-derived materials
- Best grades: 5.11–5.14+ (YDS) / V4+ bouldering
- Best for: Steep sport routes, overhangs, Red River Gorge hard routes, Smith Rock, Rifle
SWIFT — All-Round Vegan Climbing Shoe
The SWIFT is the all-round option in the Castiron Grip adult line — lace-up closure, moderate downturn profile, medium-high volume, and a fully synthetic upper. It suits the widest range of terrain types and climber foot shapes, making it the most adaptable vegan climbing shoe in the range. For climbers moving between gym, crag, and multi-pitch in the US and Canada, the SWIFT covers all bases.
- Price: $109 USD
- Closure: Lace-up — precise fit adjustment
- Profile: Moderate
- Volume: Medium-high
- Upper: Fully synthetic — no animal-derived materials
- Best grades: 5.8–5.12 (YDS) / V0–V6
- Best for: All-round use, slab, multi-pitch, gym, Yosemite, Squamish, Gunks
N23 — Entry-Level Vegan Climbing Shoe
The N23 is the most accessible adult shoe in the Castiron Grip line at $99, with dual-velcro closure, a moderate downturn profile, and a fully synthetic upper. For climbers at the start of their synthetic or vegan footwear journey, the N23 delivers performance at gym and beginner outdoor grades without any animal-derived materials.
- Price: $99 USD
- Closure: Dual velcro
- Profile: Moderate downturn
- Volume: Medium
- Upper: Fully synthetic — no animal-derived materials
- Best grades: 5.6–5.11 (YDS) / V0–V4
- Best for: Gym, indoor bouldering, intro sport routes at Red River Gorge, Joshua Tree, Squamish
How Synthetic Performs vs Leather
For most gym and sport climbing applications, a quality synthetic upper performs on par with leather. The primary difference climbers notice is the break-in curve. Leather shoes stretch and mold to the foot over multiple sessions, which means the initial fit often feels tighter than the long-term fit. Synthetic shoes deliver their true fit immediately — what you feel in the shop or on first use is what you get.
This makes sizing more predictable with synthetic shoes. Leather shoes are often sized down aggressively to account for stretch; synthetic shoes require less aggressive sizing down because the material holds its shape. For beginner and intermediate climbers, this predictability is an advantage.
At advanced grades on technical rock, some climbers prefer leather for its specific stretch and mold characteristics. The Castiron Grip adult line demonstrates that synthetic construction can deliver full performance across all grade ranges without that trade-off.
Caring for Synthetic Climbing Shoes
Synthetic climbing shoes are generally easier to maintain than leather. Key care points for US and Canada climbers:
- Air dry after every session — do not leave in a hot car or direct sunlight
- Use a shoe brush to remove chalk and dirt from the rubber
- Store in a breathable bag, not a sealed container
- Avoid machine washing — hand wash with mild soap if needed and air dry fully
- Resole when the rubber wears through — do not wait until the rand is damaged
FAQ
Are all Castiron Grip climbing shoes vegan?
The adult models — PR23, N23, and SWIFT — use fully synthetic uppers with no animal-derived materials. Check product pages for the kids range for current material specifications.
Do synthetic climbing shoes perform as well as leather?
Yes, for gym and sport climbing at all grade levels. The primary difference is the break-in curve — synthetic shoes fit consistently from session one, leather stretches and molds over time.
Should I size differently for synthetic climbing shoes?
Synthetic shoes stretch less than leather, so you may not need to size down as aggressively. Start at your normal sizing down recommendation and adjust from there rather than over-sizing down.
Can I resole vegan synthetic climbing shoes?
Yes. Resoling is available for synthetic shoes just as for leather. A good resole extends shoe life significantly and is more sustainable than replacement.
Are the Castiron Grip kids shoes also vegan?
Verify current material specs on the individual product pages for HUG, ONE, and Little ALIEN before making a purchase decision based on vegan criteria.
USA and Canada Climbing Resources
Continue the USA and Canada climbing shoe hub:
Flat feet climbing shoes | Best climbing shoes under $100 | Indoor climbing shoes | Kids climbing shoes
Written by T-K