Spring is when things really start to come to life, including the beach. But the Reef Ortho-Spring Men’s Thongs keep the beach vibes going strong no matter what time of year it is.. Eco-One is an organic additive that enhances the biodegradation process through a series of chemical and biological processes when disposed of in a biologically active landfill. Outfitted with anatomical arch support to keep you comfortable through every adventure. Treat your feet to instant comfort with our softest shoes ever. Crafted from premium materials providing ultimate comfort.