Black casual sneakers from Z-COIL (Zee-Coil) featuring spring soles. Originally designed for medical use, these sneakers are said to significantly reduce strain, so they are likely very comfortable for those who wear the correct size. I usually wear 28cm in New Balance, etc., and these were a perfect fit. Zcoil is not generally sold, nor is it directly sold in Japan, making it a very rare item. There is some wear and tear from the time of purchase, but I think it's not a concern for those accustomed to used or vintage items. Below is from the official Amazon product description: The Freedom is one of our best-selling styles for pain relief. With genuine full-grain leather, it blends exceptional style, fit, and performance into your daily routine. The padded heel collar and tongue add comfort to every step. The patented coil reduces impact with every step, relieving foot, leg, and hip pain. The built-in Z-Orthotic protects the plantar ligament and equalizes pressure. Z-CoiL footwear is the original spring shoe. Z-CoiL is specifically designed to relieve foot pain, leg pain, and back pain. We have sold over a million pairs since 1995. Try Z-CoiL today and see why we have found relief for plantar fasciitis, sciatica, Morton's neuroma, heel spurs, bunions, metatarsalgia, rheumatoid arthritis, diabetic neuropathy, lower back pain, and back pain. All Z-CoiL shoes have a spring coil under the heel that acts as a shock absorber, reducing stress on bones, joints, and muscles. Our patented pain relief footwear incorporates a rigid orthotic for stability and support in the foot. The forefoot contains nearly an inch of soft cushioning to protect the ball of the foot from excessive strain, and also includes a round rocker bottom sole to aid in forward motion. When you put all these elements together, you get footwear that improves posture and stability, making your steps lighter, easier, and more enjoyable. It gives you confidence in a pain-free day of movement.