The Phantom Pro is Evolv's most technically advanced climbing shoe. Inspired by hard climbing and steep angles, the Phantom Pro was completely engineered for the world's hardest single moves. Rated at a PSR 9, the Phantom Pro is a more powerful version of the Phantom, featuring our EVOWRAP™ tensioned midsole for even more power and tension. Sock closure and adjustable strap provides a snug fit around the foot. The 3.5mm outsole features Evo-74, our brand-new rubber compound stickier than TRAX SAS, giving climbers maximum friction for generating power and edging on small holds. PSR is a shoe selection tool that ranges from (1) sensitive/smearing to (10) powerful/edging. PSR 1-3. Highly sensitive smearing and volumes. PSR 4-7. Versatile for smearing and edging. PSR 8-10. Powerful for small holds. Evolv shoes are not designed to be downsized. Evolv sizing uses three categories of fit: Max Performance; Ultra Snug, Use Street shoe size. Performance; Snug, Add 1.0 size to street size. Comfort; Relaxed, add 2 sizes to street size.