The present disclosure provides footwear designs and related methods of manufacturing footwear. Certain embodiments of the footwear are particularly well suited for use traversing steep rocky uneven terrain. The footwear provides the user's foot support over steep and uneven terrain, underfoot rock protection, shock attenuation, and maximum traction. 10 Footwear 12 upper 14 sole assembly 16 outsole 18 midsole 20 chassis 22 adaptive heel component 24 adaptive forefoot component 26 heel portion of outsole 28 forefoot portion of outsole 30 arch portion of outsole 32 heel portion of midsole 34 forefoot portion of midsole 36 arch portion of midsole 38 heel stabilizer of chassis 40 forefoot platform of chassis 42 arch portion of chassis 44,46 lugs 48 heel striker 50 outside wall of heel stabilizer of chassis 52 inside wall of heel stabilizer of chassis 54 open rear portion of heel stabilizer of chassis 56, 58 windows in the outsole