Footwear / adidas / Ubersonic / adidas Ubersonic Tennis (Kids)
adidas Ubersonic Tennis (Kids) KK3821
· White/Navy/Red · GS = grade school sizesPrice, last 90 days
Lowest recorded shop price · EUR90-day low: 38,95 €; average: 45,54 €. Today from 38,95 €, the lowest we have recorded.
38,95 €41,95 €−7 %
at Zalando ES · cheapest of 5 shops
Go to Zalando ESPrice drops and restocks in your size, by email. Free, no account needed.
Sizes in stock Full adidas size guide
Where to buy
5 shopsOrdered by price, not by commission. Some links pay us a commission; your price stays the same.
ships to Spain
Spain. The terms define delivery in Spain and exclude the Canary Islands, Ceuta, and Melilla. They also exclude some hazardous goods from island destinations. Standard delivery dates depend on the product; express delivery is at most two working days when offered. Check address and product restrictions at checkout.ships to Germany
Germany. The FAQ lists other Zalando markets separately. Those market links do not confirm delivery from Zalando.de. Check address and product restrictions at checkout.ships to Spain
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.ships to Spain
Spain. The item result confirms home delivery to postcode 28001 in Madrid. This supports an ES sample for this item and postcode only. It does not confirm every Horma item or every Spanish postcode. The seller label “Enviado por Horma/BE/DE/ES/FR/IT/NL/PT” does not prove destination countries. Other Decathlon marketplaces need separate affiliate review. Check address and product restrictions at checkout.delivery unverified
Delivery destinations are unverified. Check the shop’s terms.All Zalando ES codesAll adidas codesAll JD Sports codesZalando ES dealsZalando DE dealsadidas dealsDecathlon dealsJD Sports dealsadidas deals todayadidas releases
Fact sheet
Details
- Brand
- adidas
- Style code
- KK3821
- Colourway
- White/Navy/Red
- Manufacturer
- adidas BV (Amsterdam), Hoogoorddreef 9-A, 1101 BA Amsterdam, NL
- Gender
- Kids
- Closure
- Laces
4 more details
- Upper
- Tela/tejido sintético
- Sole
- Caucho natural
- Lining
- Textile
- Insole
- Tela
Availability by size
10 sizes are in stock, from 33 to 38⅔. 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
Ubersonic in white, navy and red is an adidas shoe for kids, closed with laces. Natural rubber makes the sole, a dense material with a matte surface rather than a gloss. Textile lines the shoe, woven cloth that stays thinner than leather and shows a milder crease. White, navy and red work as a high-contrast set: a light base, a dark cool blue and a warm red accent.
Same shoe, other colours
People also compare
 |  |  |  |  | |
|---|---|---|---|---|---|
| From today | 38,95 € | 66,00 € | 92,00 € | 71,50 € | 65,00 € |
| Shops | 5 | 25 | 25 | 24 | 24 |
| Released | — | 2025 | 2024 | 2018 | 2025 |
| RRP | — | ≈ 100 $ | ≈ 150 $ | ≈ 100 $ | ≈ 100 $ |
| Material | — | Leather | Textile | Leather | Leather |
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