THE BRUSH BLOG

Stories, gear & friction.

Field notes, build logs, and everything we learn making climbing tools.

Every clap of chalk sends a cloud into the air you're about to breathe. Photo: Sweep Climbing

Air Quality in Climbing Gyms: Chalk, Rubber and Smarter Brushing

Indoor climbing air isn't just chalk — new research finds rubber particles from shoes in it too. Here's how...

Aug 26, 2025
Boar vs. Nylon Bristles: Which Climbing Brush Should You Use?

Boar vs. Nylon Bristles: Which Climbing Brush Should You Use?

Boar-hair vs. plastic (nylon) bristles compared: grip, rock safety, indoor use, durability, and when to cho...

Aug 26, 2025

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