The ASICS 33-DFA is designed for runners looking for ground feel and a barely-there, natural running experience byusing ASICS' Natural33 last for anatomical comfort. Seamless construction for a slipper-like fit and feel. Adaptive heel reinforcements keep your heel effortlessly secure. Lightweight Solyte® midsole for cushioning and improved durability. FluidAxis anatomically correct deep flex grooves are aligned to your foot's joints for adaptive load and positional change on every step. 4mm drop. Blown AHAR (ASICS® High Abrasion Rubber) outsole for enhanced cushioning and durability. International Shipping is not available. 6.9 oz.