Footwear / New Balance / FuelCell / FuelCell Sigma SD-X 'White Black'
FuelCell Sigma SD-X 'White Black'
USDELRCX · Black/White · 2021
Your size, by email. Free, no account needed.
Some of the links below pay us a commission. Your price never changes. Shops are ordered by price, not by what they pay us.
Where to buy
No shop we check listed this today.
We check again tomorrow at 06:00.
Price, last 90 days
Lowest recorded shop price · EURDetails
About this product
The New Balance FuelCell Sigma SD-X ‘White Black’ showcases a simple two-tone finish on a performance track spike made for 60m to 400m races. The seamless white knit upper features traditional lace-closure and a sock-like elastic collar. Oversized NB branding sweeps across the lateral forefoot. The lightweight, airy build rides on a FuelCell foam midsole, enhanced with a full-length carbon fiber plate for added responsiveness. Underfoot, the contrasting black outsole uses built-in pins to deliver explosive acceleration.
Size conversionEU · US · UK · A conversion chart, not stock +−
Scroll within the table to compare sizes.
This table scrolls within its region. Focus this region and use the arrow keys to compare sizes.
| EU | US | UK |
|---|---|---|
| 32 1/2 | 1 | |
| 33 | 1.5 | 1 |
| 33 1/2 | 2 | 1.5 |
| 34 1/2 | 2.5 | 2 |
| 35 | 3 | 2.5 |
| 35 1/2 | 3.5 | 3 |
| 36 | 4 | 3.5 |
| 37 | 4.5 | 4 |
| 37 1/2 | 5 | 4.5 |
| 38 | 5.5 | 5 |
| 38 1/2 | 6 | 5.5 |
| 39 1/2 | 6.5 | 6 |
| 40 | 7 | 6.5 |
| 40 1/2 | 7.5 | 7 |
| 41 1/2 | 8 | 7.5 |
| 42 | 8.5 | 8 |
| 42 1/2 | 9 | 8.5 |
| 43 | 9.5 | 9 |
| 44 | 10 | 9.5 |
| 44 1/2 | 10.5 | 10 |
| 45 | 11 | 10.5 |
| 45 1/2 | 11.5 | 11 |
| 46 1/2 | 12 | 11.5 |
| 47 | 12.5 | 12 |
| 47 1/2 | 13 | 12.5 |
| 48 1/2 | 13.5 | 13 |
| 49 | 14 | 13.5 |
| 50 | 15 | 14.5 |
| 51 | 16 | 15.5 |
| 52 | 17 | 16.5 |
Reference conversions only; this chart does not measure your foot or describe product fit.
Same shoe, other colours
People also compare
A sneaker shop in Ibiza since 2019. In 2026 we stopped selling and started checking.
Shop prices and available sizes, checked daily. The shelves are empty; the spreadsheet is not. The story