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A standard feature in all their boots, Blundstone's Shock Protection System® (SPS®) has revolutionized comfort in footwear. SPS® directly reduces workplace fatigue and orthopedic problems in the lower back, legs and feet. Dynamic tests indicate an average 33% reduction in shock transmitted to the leg while at a brisk walking pace. Taking the technology even further, SPS x~tra® adds an additional Poron® strike pad in the heel strike zone for an extra layer of shock protection.