La Sportiva Aequilibrium ST GTX Mountaineering Boots Yellow/Black Size 48

Engineered for technical mountaineering, the La Sportiva Aequilibrium ST GTX delivers a semi-automatic crampon-compatible platform with a stiff flex and a Vibram SpringLug Tech outsole featuring the Impact Brake System. The GORE-TEX Performance Comfort membrane keeps water out while allowing sweat to escape, and the water-repellent high-tenacity Nylon upper with Honey-Comb Guard reinforcements and TPU rand shrugs off abrasion. At approximately 0.73 kg per boot (EU 48), it balances protection and agility for glacier crossings and high-altitude treks.

Overview

The Aequilibrium ST GTX is a unisex mountaineering boot built for demanding alpine environments. Its upper combines water-repellent high-tenacity Nylon 60.6 with Honey-Comb Guard reinforcements and a protective TPU rand, while the GORE-TEX Performance Comfort lining provides reliable waterproofing and breathability. The polyurethane foam midsole with TPU insert and HoneyComb Guard technology offers cushioning and torsional stability, and the Vibram SpringLug Tech outsole with Impact Brake System ensures confident traction on rock, snow, and ice. A traditional lacing system and La Sportiva Ergonomic footbed complete the package for a secure, comfortable fit.

What stands out

• Semi-automatic (B2) crampon compatibility for technical routes
• GORE-TEX Performance Comfort membrane: waterproof and breathable
• Vibram SpringLug Tech outsole with Impact Brake System for superior grip
• Honey-Comb Guard reinforcements and TPU rand for durability
• Lightweight construction at approximately 0.73 kg per boot (EU 48)
• Stiff flex for precision on steep terrain

Technical details

• Product type: Mountaineering Boots
• Membrane: GORE-TEX Performance Comfort
• Upper material: Water-repellent high-tenacity Nylon 60.6 with Honey-Comb Guard reinforcements and TPU rand
• Lining material: GORE-TEX Performance Comfort
• Midsole: Polyurethane foam with TPU insert, HoneyComb Guard
• Outsole: Vibram SpringLug Tech with Impact Brake System
• Crampon compatibility: Semi-automatic (B2)
• Closure system: Lacing
• Footbed: La Sportiva Ergonomic
• Weight (per boot): 0.73 kg (approx. for EU 48)
• Colour: Yellow / Black
• Size (EU): 48
• Size (US Men's): 13.5
• Size (UK Men's): 13
• Intended use: Technical mountaineering, glacier crossing, high-altitude trekking
• Waterproofing: Yes
• Breathability: Yes
• Flexibility: Stiff
• Gender: Unisex
• Origin: Made in Italy

Our verdict

The La Sportiva Aequilibrium ST GTX is a top-tier choice for mountaineers who demand lightweight performance without sacrificing protection. Its GORE-TEX membrane, stiff flex, and semi-automatic crampon compatibility make it a versatile tool for everything from glacier slogs to technical ascents. The Vibram outsole and Honey-Comb Guard reinforcements ensure long-lasting durability, while the unisex design and precise sizing (EU 48) accommodate a wide range of users. If you're serious about alpine climbing, this boot delivers the performance you need.