Build quality was pretty good for the price. The base of the mount is thick rubber which contours to the top of any helmet. I struggled with choosing a size when ordering. Will update review once I send them back and receive my normal size . I chose these to replace a comfortable pair of Merrell Moab mid goretex which only lasted 6 months before the sole came away. The Mu6 initially looked promising, and certainly demonstrates a high caliber of quality in the construction and design of the device. my regular sandals size is 10. We are renting out our condo on weekends over the winter months and did not want to allow renters use of our closet. And if you didnt, your hair looks worse than before you washed it :/ A lot of missed opportunity.