Spira Leah - Black $140.00 Spira Classic Leather - Women - Black $140.00 Spira Classic Leather Men - White $140.00 Spira Addison - Brown $140.00 Spira Milan Suede - Brown $160.00 Spira Helix Sport Women - Black $160.00 Women's Spira     Men's Spira Introducing the Duck Dynasty Performance Trainer. The official licensed shoe of the A&E Network’s hit TV show, Duck Dynasty. NOT ALL SHOES ARE CREATED EQUAL Spira® is an advanced footwear brand premised upon a patented footwear technology called WaveSpring®. The WaveSpring® is a stable and lightweight spring that is placed in the heel and/or forefoot of our shoes. Each spring is calibrated based upon the size of the shoe and helps protect against fatigue, stress, shock and impact forces. Experience the "Wow" Factor! "Wow!" That's what many say who try on a pair of Spira shoes for the first time. People can usually feel the difference right away thanks Spira's unique and patented WaveSpring technology. The "mechanical" cushioning system can help you do more, go farther, go harder, with less stress on your feet and joints. Think of our technology as "little shock absorbers" for your body. Whether you stand, walk, jog, run exercise at the gym or take pleasure in leisure activites, Spira can help make all more omfortable and enjoyable. WAVESPRING® TECHNOLOGY The WaveSpring® is a stable and lightweight spring that is placed in the heel and forefoot of every Spira® running shoe. Our patented WaveSpring® technology allows people to participate in their activities for longer periods of time, with far less stress on muscles and joints. Think of our technology as “little shock absorbers” for your body. For years, athletic and comfort shoe engineers have been trying to create a buffer between the foot and the road. The solution is Spira's WaveSpring™ technology. It sends expended energy back to the wearer, and it's found inside every pair of Spira athletic walking and running shoes. Spira shoes engineered cushioning system reduces stress and fatigue by returning 87-96% of energy normally lost to the ground. This not only increases performance levels, but also reduces risk of injury. -WaveSpring™ returns energy with every step -WaveSpring™ is light and compact -WaveSpring™ technology will not break down Currently, USATF rule 143.3 bans shoes giving runners an unfair advantage through the use of springs. This hasn't stopped runners around the world from embracing the health and performance benefits of WaveSpring™ Technology. Spira will serve as the official performance footwear sponsor of Disney's ™Endurance Series events at Walt Disney World Resort near Orlando, Fla. and Disneyland Resort in Anaheim, Calif. More on Spira's WaveSpring Technology WaveSpring™ returns energy with every step. Ray Frederickson, president of Sports Biomechanics, Inc. compared typical midsole materials found in many athletic shoes to running in sand. While initially perceived as soft and comfortable, these shoes require the wearer to exert greater effort. Muscles must work harder, causing fatigue and increasing risk of injury. WaveSpring™ is light and compact. The WaveSpring is laterally stable, lightweight, compact and easily fits into a typical shoe midsole. WaveSpring™ technology will not break down. Traditional midsole materials work through compression and often breakdown quickly. WaveSpring is mechanical, so the spring will outlast the shoe. The Spira shoe wearer will have a "new shoe" feel from the first day it is worn to the last.