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What is The Difference Between The Classic and Heavy Duty Heel Cups?

Both Tuli’s Classic Heel Cups and heavy duty heel cups work with the same patented multi-cell, multi-layer “waffle” design that absorbs shock and returns impact energy just like the system naturally found in your feet. But, if you’re in need of a little extra support it’s Tuli’s Heavy Duty Heel Cups that you need. Twice as thick as Classic Heel Cups, they are perfect in athletic shoes or more spacious lace-up shoes (like work boots, running shoes, etc.).