Outside they seem quite strong, but the inside socks began to fall apart after 2 days. The suede on both insoles was peeling and puckering underfoot, causing significant discomfort. The red foam on the insole also started to crack and turned my socks red. Stitching around the front of a boot also indicated poor workmanship. At almost $200 including tax, this pair of shoes was a huge disappointment. I called Revain and they accepted a full refund even though I was wearing the shoes. It's definitely not the Topsiders quality I've had in over 40 years of sailing.