ADIDAS ULTRA BOOST 21 STELLA MCCARTNEY SIGNAL ORANGE WOMENS
In stock · Ready for dispatch
Free tracked UK delivery · dispatched within 24/48 hours · arrives in 1–4 business days
Delivery estimate
Free tracked delivery · estimated arrival 5–7 business days
Delivery estimate
Free tracked delivery · estimated arrival 5–10 business days
Delivery estimate
Free tracked delivery · estimated arrival 3–5 business days
| UK | EU | US | Foot length |
|---|---|---|---|
| UK 3.5 | 36 | US 5.5 | 22.0 cm |
| UK 4 | 36 2/3 | US 6 | 22.4 cm |
| UK 4.5 | 37 1/3 | US 6.5 | 22.9 cm |
| UK 5 | 38 | US 7 | 23.3 cm |
| UK 5.5 | 38 2/3 | US 7.5 | 23.7 cm |
| UK 6 | 39 1/3 | US 8 | 24.1 cm |
| UK 6.5 | 40 | US 8.5 | 24.6 cm |
| UK 7 | 40 2/3 | US 9 | 25.0 cm |
| UK 7.5 | 41 1/3 | US 9.5 | 25.4 cm |
| UK 8 | 42 | US 10 | 25.8 cm |
| UK 8.5 | 42 2/3 | US 10.5 | 26.3 cm |
| UK 9 | 43 1/3 | US 11 | 26.7 cm |
| UK 9.5 | 44 | US 11.5 | 27.1 cm |
| UK 10 | 44 2/3 | US 12 | 27.5 cm |
| UK 10.5 | 45 1/3 | US 12.5 | 27.9 cm |
| UK 11 | 46 | US 13 | 28.4 cm |
| UK 11.5 | 46 2/3 | US 13.5 | 28.8 cm |
| UK 12 | 47 1/3 | US 14 | 29.2 cm |
| UK 12.5 | 48 | US 14.5 | 29.6 cm |
| UK 13 | 48 2/3 | US 15 | 30.1 cm |
| UK 13.5 | 49 1/3 | US 15.5 | 30.5 cm |
| UK 14 | 50 | US 16 | 30.9 cm |
| UK 15 | 51 1/3 | US 17.5 | 31.8 cm |
Conversion shown for adidas (women’s). All sizes on this page are UK — pick your UK size above. Full size guide ›
- Low stock - 1 item left
BRILLIANT
BRILLIANT SERVICE, AUTHENTIC TRAINERS, FAST DELIVERY. WILL DEFINITELY BE ORDERING FROM PS AGAIN.
Sabiul Hoque
Fantastic service
Fantastic service, next day delivery. The trainers are perfect. Really pleased have used twice for Jordan’s b
Steph Clifford
Impeccable condition, astonishingly fast
Recently purchased a pair of shoes and was thoroughly impressed. The shoes arrived in impeccable condition and the delivery speed was astonishingly fast. Highly recommend!
Marteinn Gunnarsson
Such quick delivery so pleased
Such quick delivery so pleased
Amy Marchant
Verified reviews on Trustpilot from Project Sneakers customers
Verified
Authenticated in-house
Every pair is inspected & verified by our team before it ships.
The Ultraboost 21 from Stella McCartney represents a marriage of performance and conscious design. This women's silhouette features Stella's signature sustainable approach, with a striking signal orange upper that commands attention without compromise. The responsive Boost midsole delivers comfort for daily wear, whilst the refined aesthetic elevates beyond the everyday trainer.
Crafted with consideration for environmental impact, this collaboration balances bold colour with understated sophistication. The clean lines and purposeful construction speak to both heritage and forward-thinking design, making it equally at home on the street or in transit.
SKU: GZ4383
Every pair is brand new and unworn, supplied in its original box. Nothing we sell is used, worn or ex-display — just deadstock, ready to wear.
Every pair is verified 100% authentic in-house before it ships — checked against known-authentic references for materials, stitching, labelling and box details.
Fast UK tracked delivery, with next-day options at checkout. Orders are dispatched securely and double-boxed to protect the shoe box in transit.
Not the perfect fit? Enjoy hassle-free 14-day returns & exchanges. Full details on our Shipping Policy.
