Brooks Glycerin 21 Shoe Men's Footwear Brooks Glycerin 21 Review: Lofty Ambitions Believe in the Run Men's Glycerin 23 Amazon.com Brooks Mens Glycerin GTS 22 Supportive Running Shoe Brooks Glycerin 22 Review: Tuned to A Higher Frequency Believe in the Run. Savor every stride in the men's Glycerin 23, featuring premium, tuned cushioning for plush landings and powerful toe offs. Best for Road running, Everyday runs, Long runs Cushion Plush Plush Experience luxuriously soft landings with powerful toe offs. Support Balanced support Balanced support Secure heel with dynamic forefoot helps provide inherent stability Midsole drop 8mm Weight 10. 6oz 300. 5g Features Plush, tuned cushioning, Accommodating fit, Smooth, stable transitions Sustainability 58. 1 % Recycled materials in the upper