Women's Glycerin 21The neutral Brooks Glycerin 21 Running Shoe for Women provides a plush ride thanks to more DNA LOFT v3 cushioning than before plus a new, more streamlined upper that delivers structure and breathability. Enjoy supreme softness and ultimate comfort from your first step. Upper New, engineered warp knit upper is breathable and allows for a flexible, accommodating fit while staying soft against your foot Recycled materials in the upper 59. 7 % 4. 1