The La Sportiva Jackal II BOA is a high-performance mountain
running shoe for ultra-long distances.

It features the scientifically tested and proven PerformFit™ Wrap
powered by the BOA® Fit System for a fast, effortless precision fit.

Two BOA® dials on the protective upper in combination with a
double 3-layer microfiber closure flap ensure a perfect zonal
adjustment across the foot for maximum heel hold. This increases
stability and reduces landing impact in the most technical sections
of an ultra-marathon.

Features:

• Lining: Mesh with high abrasion resistance
• Footbed: Ortholite® Hybrid Mountain Running®Ergonomic 4 mm
• Sole: FriXion® White with Impact Brake System
• Upper: Sandwich mesh (toe and tongue) thermo-adhesive TPU
  reinforcements side panels in mono-filament Nylon collar in
  stretch jersey
• Midsole: EVA with Infinitoo™ Technology rock-shield in high density
  EVA additional internal cushioning platform
• Insole: Ortholite® Hybrid Mountain Running® Ergonomic 4 mm
• Innovative dual density EVA sole / midsole package, one more
  cushioning and one capable of ensuring greater stability. It is equipped
  with Infinitoo ™ technology, two internal shock absorbing polyurethane
  pads with high energy return.
• Dual Dial BOA® Fit System: maximum heel hold and optimal volume
  adjustment on the front
• Double closure flap in 3-layer microfibre to ensure tightness and
  flexibility at the same time
• Technical Fit dedicated to long distance performance
• SpiyralFit tongue and collar construction in highly elastic multilayer
• Ariaprene: protects against impacts and the entry of debris, ensuring
  high breathability

Specifications: 

• Weight: 300 g (half pair)
• Drop: 7 mm
• Heel: 29 mm
• Forefoot: 22 mm
• Lug Height: 3.5mm

Tech Information: 

• Ultra Long Distance: Ideal for long distance, ultra trail and ultra
  marathon competitions or demanding training sessions. An
  extremely protective and shock absorbing boot.
• ALL GROUNDS: Versatile soles, ideal for all types of terrain
  including stone, scree, grass, moss and mud. Ideal for running
  either in high humidity or on dry ground. Incorporates the Impact
  Brake System.
• Ortholite Hybrid: Mountain Running - performance oriented 4mm.
• Made using 20% recycled material from the production process.
• Ecofriendly and washable, maximum wearing comfort, enhanced
  durability, keeps foot dry.
• Impact Brake System: The innovative system is applied to the sole to
  absorb negative ground impact, help traction and improve grip downhill.
• Frixion White: Super sticky for high performance mountain running.
  (7.5/10 Grip 5.1/10 Hardwearing
• Infinitoo: Exclusive technology that absorbs the negative impact with
  the ground and guarantees a never seen before energy return. The
  Infinitoo™ midsole maintains its original stretch features unaltered
  over time.

BOA Fit System: The BOA® Fit System delivers micro-adjustable, precision
fit engineered to perform in the toughest conditions:

• Agility and Speed
• Power and Precision
• Endurance and Health
• Durability and Quality