Developed in-house using sophisticated 3D software, ProSpike Lawn Spike Aerator Shoes feature the worlds first conical spike designed for increased lawn aeration and drainage. ProSpike Lawn Spike Aerator Shoes increase the penetration of water and nutrients, stimulate the soil ecosystem and help provide an optimum growing environment for a greener and healthier lawn. Frequent use will also deepen roots, improve absorption of fertilizers and the general quality of your lawn. Unlike metal lawn spikes, which leave a narrow hole that soon closes, the ProSpikes super tough nylon spike features a unique conical shape with external ribbing. This profile is transferred to the ground leaving a stronger, wider, hole that remains open for longer allowing water, oxygen and carbon dioxide to pass freely. For increased aeration and drainage, lawn sand can also be raked in. For comfort, ProSpike Lawn Spike Aerator Shoes feature premium quality webbing straps to ensure a secure fit to your shoe or boot that wont slip. As they have no metal parts they can also be quickly cleaned with the garden hose and wont rust. ProSpike Lawn Spike Aerator Shoes are 100% British made - even the straps and Velcro are stitched in the UK! Dimensions: 13 Super Tough 40mm Nylon Spikes per shoe. Heel to toe 29cm / 11.5 inches Widest point 13cm / 5 inches Spikes 40mm / 1.5 inches.