I bought these a couple of years ago and they are still like new. I've had no problems with the velcro coming undone so it must have just been a bad batch. They are really comfortable and cool on a long walk to the beach and fantastic for climbing around the rocks and rockpools when I'm sea fishing. I've never liked wearing most sandals and flip-flops on the rocks due to poor grip and no ankle support but these give similar support to a decent walking shoe. I also own Merrell Chameleon Wrap Slam, Chameleon Ventilator's and have just bought some WaterPro Ottowa's too and they have all been tough and very comfortable.