Adjustable Size: The 13.4*5.4 inch Aerator Shoes fit for men's shoe size 9.5-14, with 3 adjustable Velcro straps wraped around your heel and attach with hook-and-loop fasteners, no slipping and loosing Never Broken of Shoes Base: Design with using 2 Base of ALUMINUM ALLOY and PLASTIC SOLES to ensure sturdy, durable and comfortable, instead of other's only with plastic or metal soles Never Bend of Spikes: Heavy Duty Spikes add oxygen, water and nutrients to soil easily. The yeld strength reaches 675Mpa which is enough sturdy, suitable for any hard soil, rocks, or slopes. NOTE: For easier soil insertion, please wet the soil before using lawn aerator shoes Fully-Assembled: No Installation Required. No prep is required so all you have to do is slip them on and walk around. Aerate your garden like a pro. Upgrade the black lawn aerator shoes to provide you with more options Healthy and Economical Way: Aerator spike shoes provide more economical choices for garden patio grass lawn golf course, a pair of shoes with spikes on the bottom and make the grass look better by just walking around, instead of an aerator machine rental Mofeez Lawn Aerator Shoes for Grass - Pre-Assembled Grass Aerator Shoes for Lawn - Soil Yard Aerator Tool for Aerating Patio Garden, Black, Large Size