Z-CoiL shoes ® may not win a prize as the best looking shoes in town but the cleverly engineered shoes literally act as effective shock absorbers for the feet and ankles. The shoes were invented by Al Gallegos, a runner and shoe-store owner who was plagued by heel spurs, plantar fasciitis, and other foot troubles. He glued coil-spring heels to a pair of running shoes, and the Z-CoiL concept was born. Since the first Z-CoiL running shoes were manufactured in 1997, the product line has expanded to include casual dress shoes, sandals, clogs, hiking books, and work boots. The shoes come in 10 styles including a classic looking sneaker or running shoe, a hiking shoe, a boot and a sandal. Models are available for both men in women, and customers can choose between the original exposed-coil heels and the enclosed heels. The front of the sole has 20 mm (3/4") of neoprene rubber cushioning to protect the forefoot, and the shoe's footbed incorporates a rigid plastic orthosis for arch support and cradling stability. It is a firm walking or running shoe and it definitely takes the shock impact off the heel when walking quickly. According to the manufacturers Z-CoiL® relieves foot pain and aids the lower back, knee and ankle joints, muscles and sciatic nerve by absorbing up to 50% of the impact from standing, walking or running on hard surfaces. Z-CoiL shoes ® have gained a cult following among nurses, chefs, and other people who work on their feet all day.
Somewhere you will not find shoes with coils in the heels is in prisons and correctional facilities. Many institutions, such as prisons, correctional facilities, asylums, and the like, are presented with problems with contraband. Laws and/or court rulings require incarcerated people are provided with certain basic, personal effects, such as clothing and toiletries. Clever tampering or modification with personal effects often provides ideal secret compartments to conceal contraband. One of the most common stash pockets are in shoes, heels or under foot orthoses.
Designers set to developing a shoe that resisted concealment of contraband and now new shoes which are tamper resistant have been developed for institutional use. The metal free correction shoes has a clear outsole to discourage concealment of contraband is available. Seen through the translucent outsole is the coloured insole and any tampering with the outsole or attempts to conceal contraband can be easily viewed. Also any attempt to tamper with the sole layer will destroy the shoe. The shoes can be inspected for evidence of tampering or for concealed contraband by simply viewing the outsole and looking through the outsole.