Footwear / adidas / F50 / adidas F50 Hyperfast Elite Y-3 Firm Ground Kids 'Lucid Ray Blue Core Black Collegiate Royal'
adidas F50 Hyperfast Elite Y-3 Firm Ground Kids 'Lucid Ray Blue Core Black Collegiate Royal' KZ9817
Lucid Ray Blue/Core Black/Collegiate Royal
GS = grade school sizes, EU 35½–40
Your size, by email. Free, no account needed.
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Where to buy
Sizes in stock · Across the shops below · pick yours
Verified delivery destinations
Spain.
The terms cover the Spanish mainland and the Balearic Islands. They exclude Ceuta, Melilla, and the Canary Islands. Other adidas country stores are separate storefronts.
Check address and product restrictions at checkout.
Verified delivery destinations
Spain.
The terms cover Spanish national territory except the Canary Islands, Ceuta, and Melilla. GLS and MRW options have different regional limits. The live feed row says DE, so check its country metadata. Other Topforsport country shops need separate affiliate review.
Check address and product restrictions at checkout.
Price, last 90 days
Lowest recorded shop price · EUR90-day low: 150,00 €; average: 150,00 €. Today from 150,00 €, the lowest we have recorded.
Fact sheet
Details
- Brand
- adidas
- Style code
- KZ9817
- Colourway
- Lucid Ray Blue/Core Black/Collegiate Royal
- Retail price at launch
- ≈ 200 $
- Manufacturer
- adidas BV (Amsterdam), Hoogoorddreef 9-A, 1101 BA Amsterdam, NL
- Gender
- Kids
Availability by size
14 sizes are in stock, from 28 to 38⅔. The easiest to find are 35½ and 36⅔, at 2 shops. 28, 28½, 29 and 30 and 8 more are at one shop only. The cheapest shop changes with the size: 2 different shops today, so pick your size before you compare.
Size conversion
EU · US · UK · A conversion chart, not stockScroll 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 |
|---|---|---|
| 28 | 10.5K | 10K |
| 28 1/2 | 11K | 10.5K |
| 29 | 11.5K | 11K |
| 30 | 12K | 11.5K |
| 30 1/2 | 12.5K | 12K |
| 31 | 13K | 12.5K |
| 31 1/2 | 13.5K | 13K |
| 32 | 1Y | 13.5K |
| 33 | 1.5Y | 1Y |
| 33 1/2 | 2Y | 1.5Y |
| 34 | 2.5Y | 2Y |
| 35 | 3Y | 2.5Y |
| 35 1/2 | 3.5Y | 3Y |
| 36 | 4Y | 3.5Y |
| 36 2/3 | 4.5Y | 4Y |
| 37 1/3 | 5Y | 4.5Y |
| 38 | 5.5Y | 5Y |
| 38 2/3 | 6Y | 5.5Y |
| 39 1/3 | 6.5Y | 6Y |
| 40 | 7Y | 6.5Y |
Reference conversions only; this chart does not measure your foot or describe product fit.
About this product
The F50 comes in Lucid Ray Blue, Core Black and Collegiate Royal from adidas, for kids, as Hyperfast Elite with Y-3 and a firm-ground build. Lucid ray blue is a clear bright blue, core black is dense and dark, and collegiate royal is a saturated blue that reads stronger than the first. Seen as a set, the two blues differ in depth while the black separates them.
Same shoe, other colours
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|---|---|---|---|---|---|
| From today | 150,00 € | 52,00 € | 71,95 € | 59,40 € | 92,00 € |
| Shops | 2 | 27 | 25 | 25 | 25 |
| Released | — | 2018 | 2025 | 2025 | 2024 |
| RRP | ≈ 200 $ | ≈ 100 $ | ≈ 100 $ | ≈ 100 $ | ≈ 150 $ |
| Material | — | Leather | Leather | Leather | Textile |
From reselling sneakers to checking prices. In Ibiza since 2019; since September 2026 we sell nothing.
Shop prices and available sizes, checked daily. The shelves are empty; the spreadsheet is not. The story