Running requires protecting both the feet and the knees, and the Brooks Ariel 20 running features an enhanced construction with the maximum cushioning for much-needed support and GuideRails technology that keeps excess movement at bay. Predecessor: Ariel 18. Support Type: Overpronation/Stability. Cushioning: Maximum cushioning. Surface: Road. Differential: 12 mm. Engineered mesh upper with an embroidered saddle and eyestay for a more modern look. Lace-up closure. External heel counter helps stabilize the foot. Plush tongue and collar. Breathable mesh lining wicks away moisture and offers a great in-shoe feel. Ultimate Sockliner has a removable insole and offers advanced cushioning for a plush in-shoe feel. BioMoGo DNA midsole supplies long-lasting cushioning, and features an environmentally-friendly build that breaks down 50 times quicker at the landfill, compared to similar midsole materials. Full-length Segmented Crash Pad encourages a smooth heel-to-toe transition with each step. Durable rubber outsole with unique tread pattern for reliable traction. Imported. Measurements: Weight: 11 oz Product measurements were taken using size 8, width B - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.