La Sportiva Stream GTX hiking boots - carbon/apple green size: 43_5

At just 850 g per pair, the La Sportiva Stream GTX redefines lightweight performance for fast hiking. Built around a GORE-TEX® SURROUND® membrane, it delivers 360° waterproof protection while actively venting heat and moisture from the sole—keeping your feet dry from both outside and inside.

Overview

The Stream GTX is a mid-cut hiking boot engineered for speed hiking, light trekking, and fastpacking. Its abrasion-resistant mesh upper features Nano-Cells™ 2.0 structure for breathable support, reinforced by a PU TechLite rand and toe cap for durable protection on rocky trails. Inside, a compression-molded EVA midsole with TPU inserts balances cushioning and stability, while the Vibram® XS Trek outsole with Impact Brake System™ ensures confident grip on varied terrain.

What stands out

• GORE-TEX® SURROUND® technology: waterproof yet highly breathable, with underfoot ventilation channels.
• Ultra-lightweight build: only 850 g per pair (EU 43.5), reducing fatigue on long approaches.
• Vibram® XS Trek outsole with 5 mm lugs and Impact Brake System™ for enhanced traction and downhill control.
• Ortholite® Mountain Hiking 5 mm footbed provides long-lasting cushioning and moisture management.
• Precision lacing system with a mid-cut collar for ankle support without restricting mobility.

Technical details

• Upper: Abrasion-resistant mesh with Nano-Cells™ 2.0 structure, PU TechLite rand and toe cap
• Lining: GORE-TEX® SURROUND®
• Midsole: Compression molded EVA with TPU inserts
• Outsole: Vibram® XS Trek with Impact Brake System™
• Footbed: Ortholite® Mountain Hiking 5 mm
• Weight (pair, approx.): 850 g (EU 43.5)
• Lug depth: 5 mm
• Heel-toe drop: 10 mm
• Intended use: Fast hiking, speed hiking, light trekking
• Colour: Carbon / Apple Green
• Size: EU 43.5 (US Men's 10.5, UK 9.5)

Our verdict

The La Sportiva Stream GTX is a top-tier choice for hikers who demand speed without sacrificing protection. Its GORE-TEX® SURROUND® membrane and Vibram® outsole deliver exceptional performance on fast, technical terrain, while the low weight keeps you moving efficiently. A benchmark in lightweight hiking footwear.