Based on the context of "CSTB 2021" and the terminology used, this appears to be a reference to a scientific paper or conference presentation, likely in the field of marine biology or environmental science, specifically regarding coral reefs.
Here is a breakdown of why this write-up is considered "interesting" and the likely context behind it:
1. Edging (8/10): The V4 CSTB features a moderately stiff midsole (rare for an aggressive shoe). This makes it surprisingly competent on small foot chips and vertical terrain. You can stand on a 5mm edge with confidence—something most soft, aggressive shoes fail at. cd reef v4 cstb 2021
2. Smearing (6/10): Because of that stiffness, smearing on polished slabs is not its forte. You have to actively press down your heel to get the rubber to engage. It’s doable, but a softer shoe (like the Dragos) is better here.
3. Hooking (9/10): This is where the Reef shines. The heel is a masterclass in design. The rubber is thick, wraps high over the Achilles, and features a subtle "tooth" pattern on the back. Heel hooks on roofs feel locked and secure. Toe hooks are equally impressive due to the generous rubber patch on the top of the toe box. Based on the context of "CSTB 2021" and
4. The "CSTB" Magic (10/10): Here’s the unique selling point. This shoe laughs at humidity and indoor sweat. The inner lining is treated with a bacteriostatic and hydrophobic layer. Your feet stay noticeably drier, and the shoe doesn’t develop "climbing shoe stink" for months. Furthermore, the rubber compound (CD’s proprietary Grip Force 2.0) actually gains a little tackiness when the holds are slightly damp. If you climb in a humid gym or on dank, shaded limestone, this is a superpower.
If you are a civil engineer submitting a Permis de Construire (Building Permit) or a Lotissement (Subdivision) plan in France, Belgium, or Switzerland, local water agencies (like the Agence de l'Eau) often reference the CSTB database. Display: OLED / LCD / sunlight-readable; size (inches)
A product certified prior to 2021 (e.g., V3 from 2018) may not comply with the latest Zonage Pluvial (Pluvial Zoning) requirements. The 2021 certification ensures: