Home › Footwear › Running

adidas UltraBoost 21 'Carbon Solar Red'

Name: adidas UltraBoost 21 'Carbon Solar Red'
Brand: adidas
SKU: FY3952
Availability: InStock

adidas · Style FY3952 · Released 2021-06-11

from $188.50

Select a size:

Size chart — adidas

Full adidas size guide

Use the chart below to convert between US, UK, EU and JP sizes.

Men

US	UK	EU	JP (cm)
4	3.5	36	22.1
4.5	4	36 2/3	22.5
5	4.5	37 1/3	22.9
5.5	5	38	23.3
6	5.5	38 2/3	23.8
6.5	6	39 1/3	24.2
7	6.5	40	24.6
7.5	7	40 2/3	25.0
8	7.5	41 1/3	25.5
8.5	8	42	25.9
9	8.5	42 2/3	26.3
9.5	9	43 1/3	26.7
10	9.5	44	27.1
10.5	10	44 2/3	27.6
11	10.5	45 1/3	28.0
11.5	11	46	28.4
12	11.5	46 2/3	28.8
12.5	12	47 1/3	29.3
13	12.5	48	29.7
13.5	13	48 2/3	30.1
14	13.5	49 1/3	30.5
14.5	14	50	31.0
15	14.5	50 2/3	31.4
16	15	51 1/3	31.8
17	16	52 2/3	32.6
18	17	53 1/3	33.5
19	18	54 2/3	34.3
20	19	55 2/3	35.2

Women

US	UK	EU	JP (cm)
5	3.5	36	22.1
5.5	4	36 2/3	22.5
6	4.5	37 1/3	22.9
6.5	5	38	23.3
7	5.5	38 2/3	23.8
7.5	6	39 1/3	24.2
8	6.5	40	24.6
8.5	7	40 2/3	25.0
9	7.5	41 1/3	25.5
9.5	8	42	25.9
10	8.5	42 2/3	26.3
10.5	9	43 1/3	26.7
11	9.5	44	27.1
11.5	10	44 2/3	27.6
12	10.5	45 1/3	28.0
12.5	11	46	28.4
13	11.5	46 2/3	28.8
13.5	12	47 1/3	29.3
14	12.5	48	29.7
14.5	13	48 2/3	30.1
15	13.5	49 1/3	30.5
15.5	14	50	31.0

Kids

US	UK	EU	JP (cm)
1k	0k	16	8.1
2k	1k	17	9.0
3k	2k	18	9.8
4k	3k	19	10.6
5k	4k	20	11.5
5.5k	5k	21	12.3
6k	5.5k	22	12.8
6.5k	6k	23	13.2
7k	6.5k	23.5	13.6
7.5k	7k	24	14.0
8k	7.5k	25	14.5
8.5k	8k	25.5	14.9
9k	8.5k	26	15.3
9.5k	9k	26.5	15.7
10k	9.5k	27	16.1
10.5k	10k	28	16.6
11k	10.5k	28.5	17.0
11.5k	11k	29	17.4
12k	11.5k	30	17.8
12.5k	12k	30.5	18.3
13k	12.5k	31	18.7
13.5k	13k	31.5	19.1
1	13.5k	32	19.5
1.5	1	33	20.0
2	1.5	33.5	20.4
2.5	2	34	20.8
3	2.5	35	21.2
3.5	3	35.5	21.6
4	3.5	36	22.1
4.5	4	36 2/3	22.5
5	4.5	37 1/3	22.9
5.5	5	38	23.3
6	5.5	38 2/3	23.8
6.5	6	39 1/3	24.2
7	6.5	40	24.6
7.5	7	40 2/3	25.0

Free U.S. shipping · Authenticity guaranteed

14-day returns & equal-value exchanges — policy

Size, price & UPC details

Size	Price	UPC	Delivery
US M 7 / W 8	—	191985519042	Out of stock
US M 7.5 / W 8.5	—	191985518977	Out of stock
US M 8 / W 9	$188.50	191985518946	3-4 business days
US M 8.5 / W 9.5	—	191985518953	Out of stock
US M 9 / W 10	—	191985519035	Out of stock
US M 9.5 / W 10.5	—	191985519011	Out of stock
US M 10 / W 11	—	191985518922	Out of stock
US M 10.5 / W 11.5	—	194830833027	Out of stock
US M 11 / W 12	—	191985518939	Out of stock
US M 11.5 / W 12.5	—	191985519059	Out of stock
US M 12 / W 13	—	191985518915	Out of stock
US M 12.5 / W 13.5	—	191985518908	Out of stock
US M 13 / W 14	—	191985518991	Out of stock
US M 14 / W 15	—	191985518878	Out of stock

About the adidas UltraBoost 21 'Carbon Solar Red'

The adidas UltraBoost 21 ‘Carbon Solar Red’ spotlights the running shoe’s full-length Boost midsole with a metallic gunmetal finish. Underfoot, the Continental rubber outsole is equipped with adidas’ updated Torsion system, dubbed Linear Energy Push. The black and Carbon Primeknit upper, made in part with recycled Parley Ocean Plastic, hugs the foot in a sock-like fit. Lightweight support is provided by a smoky midfoot cage and a silver translucent heel counter. An adidas-branded tongue tag in Solar Red delivers an unexpected pop of color.