Adidas Ultra Boost 20 Stella McCartney Women's HP3217

Adidas Ultra Boost 20

Eco-Conscious Haute Couture & Boundless Energy Return: The adidas by Stella McCartney Ultraboost 20 "Core Black" Merge circular design principles with marathon-level engineering in an avant-garde performance silhouette created in partnership with British designer Stella McCartney. The HP3217 adopts an uncompromising, monochromatic "Core Black" palette, letting structural textures and technical geometry take center stage. Built on a foundation of adidas Primeblue yarn—incorporating upcycled Parley Ocean Plastic without virgin polyester—and utilizing water-saving techniques alongside full-length BOOST cushioning, this silhouette harmonizes runway aesthetics, responsible innovation, and explosive energy return.

Benefits: Engineered for dedicated road training, treadmill intervals, boutique studio sessions, and elevated athleisure rotations, this running shoe prioritizes continuous impact protection, glove-like foot containment, and eco-conscious construction. The flexible Primeknit upper dynamically stretches with the foot's natural expansion through the gait cycle, eliminating friction points and hot spots. Below, the full-length BOOST foam core absorbs heavy pavement shock and snaps back instantly, propelling you forward while preserving leg freshness over long training miles.

Key Features:

• High-Performance Primeblue Primeknit Upper: Seamless knit upper engineered using high-performance recycled yarns containing at least 75% Primeblue (made in part with Parley Ocean Plastic), completely eliminating virgin polyester.

• Water-Conscious Low-Impact Finishing: Fabric treatments focused on sustainable resource conservation, highlighting raw, natural textile textures while significantly reducing water and chemical consumption.

• Full-Length Responsive BOOST Midsole: High-density expanded TPU capsule matrix delivering plush, temperature-independent shock absorption and class-leading kinetic rebound.

• Sculptural Midfoot Stabilization Cage: Distinctive, fashion-forward supportive exterior cage designed by Stella McCartney to lock down the midfoot and stabilize the arch during dynamic lateral movement.

• Continental™-Inspired Rubber Traction Outsole: Resilient rubber outsole engineered with a flexible stretch-web pattern for confident grip across wet and dry pavement, treadmills, and studio floors.

• Ergonomic Heel Cradle Architecture: Contoured rearfoot support system engineered to cup the calcaneus securely while permitting the natural movement of the Achilles tendon.

Product Details:

• Product Name: adidas by Stella McCartney Ultraboost 20

• Silo: adidas Running x Stella McCartney Collaboration / Ultraboost Series

• Category: Women's Designer Performance Running & Luxury Athleisure Footwear

• Colourway: Core Black / Core Black / Core Black (Triple Black)

• Style Code: HP3217

• Upper Material: Engineered adidas Primeknit Textile Upper (Primeblue / Parley Ocean Plastic Content)

• Lining: Seamless Sock-Like Textile Interior

• Midsole Technology: Full-Length adidas BOOST Pellet Platform

• Outsole: Multi-Surface Stretchweb High-Traction Rubber Outsole

• Closure: Central Performance Lace-Up System Integrated with Structural Cage

• Fit: Snug, Sock-Like Performance Fit

Buyer Guidance & Fit Profile:

• Who This Product Is Best Suited For: Ideal for eco-conscious runners, boutique gym and studio athletes, and high-fashion streetwear enthusiasts seeking a murdered-out black runner that pairs marathon-level energy return with runway styling. Coordinates seamlessly with high-waisted compression tights, oversized structured outerwear, luxury track pants, and minimalist athletic crop tops. Not engineered for deep, saturated trail mud or jagged mountain scrambles where aggressive rock plates and multi-directional trail lugs are essential.

• Fit & Sizing Determination: Fits True to Size (TTS) to slightly snug, true to the compressive, sock-like nature of performance Primeknit footwear. The knit upper hugs the contours of the foot closely to ensure stability during motion. Runners with wide feet (D+ width in women's sizing) or those who prefer more volume in the toe box for long-distance foot swelling should consider going half a size up (0.5 size up) for optimal comfort.

• Recommended Conditions & Activities: Optimised for road running, treadmill workouts, studio fitness, city walking, and high-end athleisure rotations in dry-to-mild weather. Care Recommendation: Spot clean the black Primeknit upper and exterior cage using a soft microfiber cloth or soft-bristled brush dipped in lukewarm water and mild technical sneaker detergent; wipe down the black BOOST midsole with a damp cloth; avoid washing machines and tumble dryers, as mechanical agitation and heat weaken the recycled knit fibers and damage the midsole bonding; remove the insoles and allow the shoes to air dry naturally at room temperature in a well-ventilated, shaded space away from direct sunlight or radiators.