Brook’s maximum cushioned neutral road running shoe, the Glycerin 21, is designed to be even softer than its predecessor and deliver the ultimate in comfort. The midsole, packed with premium nitrogen-infused DNA LOFT 3 foam, is 2mm thicker to give you supreme softness underfoot and a luxurious ride. The new upper also has a plush, soft feel, precisely engineered to follow the shape of your foot and keep it in a secure hold whilst being very breathable. The wide platform helps to encourage a stable stride.