HOKA ONE ONE Women's W Kailua Trail Running Shoe Synthetic-And-Mesh Rubber sole Designed for maximum cushioning, energy return, comfort and protection without hindering performance and movement Flexible TPU overlays provide lightweight, targeted support Heel pull loop for an easier on and off. Midsole: Hoka One One midsole foam is 30% softer than in most traditional running shoes and has 2.5 times more volume. This dissipates up to 80% more shock associated with heel striking and allows up to 20 mm of compression in the heel. Midsole Differential: 5 mm