Footwear / adidas / Ultra Boost / adidas Ultra Boost 4.0 Grey Four
adidas Ultra Boost 4.0 Grey Four
CP9251 · Grey Four · 2018
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 adidas Ultra Boost 4.0 Gray Four is a versatile and stylish running shoe that exemplifies the brand's commitment to performance and aesthetics. This iteration is part of the fourth generation of the Ultra Boost line, known for their sleek designs. The upper of the Ultra Boost 4.0 is constructed using PrimeKnit material, which offers an adaptive snug fit. It features a predominantly gray color scheme with marled texture, which helps to add a bit of depth to the design. The midsole is donned in white, while the outsole is black, adding a touch of contrast to the shoe. One of the standout features of the adidas Ultra Boost 4.0 Gray Four is the midsole, which uses Boost technology to deliver a springy feel with each step. This helps with performance and comfort when wearing for extended periods of time. The shoe was released for retail on February 21st, 2018, priced at $180.
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 | ||
| 33 | 1.5 | 1 |
| 33 1/2 | 2 | 1.5 |
| 34 | 2.5 | 2 |
| 35 | 3 | 2.5 |
| 35 1/2 | 3.5 | 3 |
| 36 | 4 | 3.5 |
| 36 2/3 | 4.5 | 4 |
| 37 1/3 | 5 | 4.5 |
| 38 | 5.5 | 5 |
| 38 2/3 | 6 | 5.5 |
| 39 1/3 | 6.5 | 6 |
| 40 | 7 | 6.5 |
| 40 2/3 | 7.5 | 7 |
| 41 1/3 | 8 | 7.5 |
| 42 | 8.5 | 8 |
| 42 2/3 | 9 | 8.5 |
| 43 1/3 | 9.5 | 9 |
| 44 | 10 | 9.5 |
| 44 2/3 | 10.5 | 10 |
| 45 1/3 | 11 | 10.5 |
| 46 | 11.5 | 11 |
| 46 2/3 | 12 | 11.5 |
| 47 1/3 | 12.5 | 12 |
| 48 | 13 | 12.5 |
| 48 2/3 | 13.5 | 13 |
| 49 1/3 | 14 | 13.5 |
| 50 | 14.5 | 14 |
| 50 2/3 | 15 | 14.5 |
| 51 1/3 | 16 | 15 |
| 52 2/3 | 17 | 16 |
| 53 1/3 | 18 | 17 |
| 54 2/3 | 19 | 18 |
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






