KEY FEATURES

• Magmatic Thermal Fabric — Engineered with volcanic ash-infused material to maximize surface skin temperature → Delivers consistent core warmth in elite cold-weather environments.
• Locksafe Zip — Designed with a high-performance secure zipper mechanism → Eliminates snags and ensures zero malfunctions during high-intensity training.
• Double Seam Stitching — Optimized with reinforced construction at critical stress points → Maximizes durability for the most rigorous outdoor conditioning sessions.
• Quick Dry — High-performance moisture-wicking technology → Accelerates evaporation to keep the athlete dry and comfortable during maximum exertion.
• Ribbed Hem Cuff — Crafted for a structured finish at openings → Delivers an optimized fit and secures superior heat retention.
• Compression Fit — Engineered for a second-skin feel → Maximizes muscle support and dominates in the most abrasive environments.

SPECIFICATIONS

• Fabric Technology: Magmatic Thermal
• Construction: Compression
• Fit: Fitted

TECHNOLOGY

MODEL INFO

On model: Ashley, 5'9" (175 cm), 185 lb (84 kg), wearing Large in Black/Silver.

Lock in warmth during your most demanding cold-weather sessions. The Virus® Sio4 Half Zip delivers volcanic ash technology to optimize temperature regulation without adding bulk. Layer it for winter conditioning or deploy it as a primary tool for outdoor training to maintain peak performance and dominate the elements.