The Smartwool Run Targeted Cushion Low Ankle Socks are the ultimate hybrid of impact protection and ultralight breathability. Designed specifically for pavement pounders and trail runners alike, these socks feature strategically placed cushioning exclusively on the heel and the ball of the foot to absorb shock. Combined with an anatomical fit, a protective Achilles tab, and high-performance ZQ-certified merino wool, they deliver a blister-free, temperature-regulated ride from your first 5K to your next marathon.

Specs & Features

​Technical Specs

• ​Model Number: SW001659

• Height: Low Ankle (Sits at the shoe collar with an extended Achilles tab to prevent friction)
• ​Cushioning: Targeted Cushion (High-density padding isolated to the heel and ball of the foot; flat knit elsewhere)
• ​Material Composition: ~54% ZQ-certified Merino Wool, 13% Nylon, 29% Recycled Nylon, 4% Elastane

​Key Features

• ​4 Degree™ Elite Fit System: A highly responsive, multi-zone elastic construction that securely hugs the arch, instep, and heel to completely eliminate internal slipping and bunching.
• ​Indestructawool™ Technology: A patent-pending, heavily reinforced knitting method in high-wear impact zones that significantly increases the durability and lifespan of the sock.
• ​Virtually Seamless™ Toe: Removes bulky internal stitching across the toe box to prevent chafing, friction, and blisters inside snug running shoes.
• ​Targeted Mesh Ventilation: Body-mapped mesh channels over the top of the foot maximize airflow and accelerate moisture evaporation.
• ​Integrated Achilles Tab: A slightly raised cushion at the back of the heel prevents the collar of your running shoe from rubbing raw against your skin.

​Care Instructions

​To preserve the premium merino fibers and performance elastics, follow these steps:

• ​Wash: Machine wash warm or cold on a gentle cycle. Always wash inside out to flush sweat salts from the cushioned loops and prevent pilling on the outside. Wash with similar colors.
• ​Detergent: Use a mild liquid detergent. Never use fabric softeners or bleach, as they will coat the wool and permanently destroy its natural moisture-wicking and thermoregulating properties.
• ​Drying: Tumble dry on low heat, or line dry in the shade to maximize the lifespan of the elastane fibers.
• ​Ironing/Dry Cleaning: Do not iron. Do not dry clean.

​X-Boundaries Professional Tips

• ​The "Sweet Spot" Runner's Choice: If Zero Cushion feels too harsh on pavement, but Light Cushion makes your feet overheat, Targeted Cushion is your goldilocks zone. It gives you the necessary shock absorption under your metatarsals and heel strikes while allowing the top of your foot to dump heat rapidly.
• ​Lock Down Your Heel: The built-in Achilles tab on this "Low Ankle" height is a game changer for runners who suffer from heel slippage. It acts as a soft bumper, keeping the sock locked in place while physically blocking debris from kicking into the back of your shoe.
• ​Post-Run Recovery: Because these are made with naturally antimicrobial merino wool, you don't necessarily have to wash them after every single short, dry run. Let them air out in a well-ventilated space overnight, and they will be fresh and ready to go the next day, which extends the overall life of the garment.