The Siren 4 features:

• 100% recycled laces and webbing
• Bellows tongue keeps out debris
• Protective and abrasion resistant rubber toe cap
• 100% recycled breathable mesh lining
• 100% recycled mesh footbed cover
• Cleansport NXT treated for natural odour control
• Removable PU footbed
• Rock plate for protection
• FloatPro Foam midsole for lightweight comfort that lasts
  
• Vibram TC5 outsole provides exceptional traction for outdoor multi-sport activities, formulated exclusively for Merrell
  
• Vibram traction lugs specifically designed to increase traction and shed debris with each step
  
• Vegan-Friendly
• Stack Height: 28.5-20.5mm
  
• Drop: 8mm
• Lug: 5mm