Proof Lab - Mill Valley, CA We are stoked to have partnered up with PROOF LAB surf shop in Mill Valley, CA which is located in the heart of beautiful Marin County. P-lab has a reputation of great service and a wide spread of shred sticks, clothing, shoes, sandals, and now Indosole. They also have an inside skatepark! Please swing by and check it out and stay tuned for an Indo's and Coconuts event happening in the near future.