There is moderate cushioning throughout the sock for a secure fit with enhanced impact protection

structure and stretch for a comfortable fit

greater flexibility

shielding the heel against shockwaves and heel strike

Altra have also pumped up the TPU overlay to help increase toe protection coverage and durability

Men's Mammut Aenergy Trail Endurance Ultra Low Size:13 There is moderate cushioning throughoutThe Mammut Aenergy Trail Endurance Ultra Low is designed for mid to long distance trail runs. These shoes deliver powerful energy return, dynamic forefoot flex and torsional stability thanks to a FLEXTRON PRO propulsion plate. Lightweight Mammut CORE Ultra foam combines with Mammut CORE Plus foam for excellent rebound and enhanced cushioning and comfort throughout the day. A custom engineered midfoot structure and lacing system secures the foot for