Granger's G10 Memory+ Insoles have a 5mm memory foam centre that gives you instant all-day comfort by conforming to the shape of your feet.__ Their microfibre top layer wicks away moisture, and a structured felt base  provides great support. __ The memory foam mid-layer is 'open-cell', improving airflow and breathability. The felt base is highly breathable too, aiding moisture management to help provide maximum comfort.Weight: 64g (pair of size 40) Microfibre top layer Open-cell memory foam middle Felt base