The back of the shoe - inside the heel - has a piece of metal that pushes through. And break my skin and create a bubble. One side is worse than the other, but both shoes have that metal detail.
Skechers Afterburn Strike Memory Men's Fashion Sneakers: Stylish Footwear for Every Occasion
45 Review
Orange Men's Vibram Ascent Insulated M Sneaker Shoes - Enhanced SEO
45 Review
π· Reebok RB1735 Safety Work Dayod
50 Review
DREAM PAIRS Liberty M: Lightweight π and Breathable Footwear for Your Active Lifestyle
59 Review