NUOLUX Green Pair of Grass Spiked Gardening Walking Revitalizing Lawn Aerator Sandals Shoes Color: Green Material: PP, nylon. Nail length: 4cm. Overall size: 30 * 13cm. Provide your lawn with the air, water, and nutrients it needs. Easily straps onto your normal shoes or boots. Creates small holes in the soil to provide grass roots with nutrients. Can be worn while mowing the lawns - trim and aerate in one go.