Adjustable Size: The 11.5* 5 inch Aerator Shoes fit for women's shoe size 6-10, men's shoe size 6-9, with 3 adjustable Velcro straps wrapped around your heel and attach with hook-and-loop fasteners, without fear of sliding and reattaching. Never Broken Shoes: The ONLY one who uses 2 Base of ALUMINUM ALLOY and PLASTIC SOLES to ensure sturdy, durable, and comfortable. Unlike other's only with plastic soles. Never Bend of Spikes: Heavy Duty Spikes add oxygen, water, and nutrients to soil easily. The yield strength reaches 675Mpa which is sturdy enough, suitable for any hard soil, rocks, or slopes. No Installation Required: the 13pcs stainless steel spikes on each shoe have been assembled. You only need to fasten your straps. Aerate your garden like a pro. (Tips: Before you "take a walk", you could water the lawn fully. ) Economical and Fun Alternative: Steel spikes fully penetrate your soil, providing the yard grass to breathe and absorb more water and nutrients, and it also helps you exercise your legs muscles! (Kindly Note: If you have any questions about LAWN AERATOR SHOES, please feel free to contact us.) Lawn Aerator Shoes