There are no issues when using or wearing them, but there is a hole in the heel due to the wrong size. These are recommended for walking or as commuter shoes because they are black. Mizuno black running shoes with a lightweight and breathable mesh upper. - Brand: Mizuno Wave Rider 27, 26 cm - Color: Black - Sole Features: Grippy outsole - Design: Lightweight and breathable mesh upper - Style: Running shoes - Size: 26 cm Thank you for viewing.