Adidas Ultraboost 4.0 Grey Four

Free US Shipping On Orders Over $175*

Color — Grey

In stock, ready to ship
Inventory on the way

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SKU: CP9251

Color: Grey Four/Grey Four

Men Sizing

Adidas Ultraboost 4.0 Grey Four

Men’s Shoes

Imagine having over 3000 energy capsules in your shoes propelling you forward no matter your sport of choice. Well, that’s precisely what Adidas has done with the Ultra Boost 4.0 'Grey Four.' The runner features a grey and green Primeknit upper with contrasting grey Three-Stripes branding on the side and white detailing on the heel cap. The sneaker also boasts a Continental rubber outsole and a full-length Boost midsole.

More Details

Primeknit Uppers

Engineered Knit

Supportive Cage

Torsion System

Fitcounter Moulded Heel Counter

boost™ Cushioning

Continental Rubber Outsole

All sales are final on all launch products (not limited to Retro Jordans, Quickstrikes, Yeezys, etc.), swimwear/underwear products, discount, promotion, and sale items.

We take pride in being one of the fastest shippers in the shoe industry. Most orders placed Monday-Friday will be shipped out the same day or next day the latest. Packages are shipped using UPS Ground 4-5 day delivery with insurance.

**During sales events, due to higher than normal volume, our order processing time is delayed 5-7 business days.

All sizes listed on Private Sneakers are US sizes. If you are used to international sizes, please use the conversion chart(s) below. Also note, all apparel measurements are in inches. If you have any further questions, please contact Customer Service at socialmedia@privatesneakers.com

Nike Shoes

Men's
US	European	UK	centimeters (cm)
7.5	40.5	6.5	25.5
8	41	7	26
8.5	42	7.5	26.5
9	42.5	8	27
9.5	43	8.5	27.5
10	44	9	28
10.5	44.5	9.5	28.5
11	45	10	29
11.5	45.5	10.5	29.5
12	46	11	30
13	47.5	12	31
14	48.5	13	32
15	49.5	14	33
Women's
US	European	UK	centimeters (cm)
5	35.5	2.5	22
5.5	36	3	22.5
6	36.5	3.5	23
6.5	37.5	4	23.5
7	38	4.5	24
7.5	38.5	5	24.5
8	39	5.5	25
8.5	40	6	25.5
9	40.5	6.5	26
9.5	41	7	26.5
10	42	7.5	27
10.5	42.5	8	27.5
11	43	8.5	27.5
11.5	44	9	28.5
12	44.5	9.5	29
Kids'
US	European	UK	centimeters (cm)
4	36	3.5	23
4.5	36.5	4	23.5
5	37.5	4.5	23.5
5.5	38	5	24
6	38.5	5.5	24
6.5	39	6	24.5
7	40	6	25
Preschool
US	European	UK	centimeters (cm)
10.5	27.5	10	16.5
11	28	10.5	17
11.5	28.5	11	17.5
12	29.5	11.5	18
12.5	30	12	18.5
13	31	12.5	19
13.5	31.5	13	19.5
1	32	13.5	20
1.5	33	1	20.5
2	33.5	1.5	21
2.5	34	2	21.5
3	35	2.5	22
Toddler
US	European	UK	centimeters (cm)
3.5	19	2.5	10.8
4	19	3	11.4
4.5	20	3.5	11.7
5	20	4	12.1
5.5	21	4.5	12.7
6	22	5	13
6.5	22	5.5	13.3
7	23	6	14
7.5	23	6.5	14.3
8	24	7	14.6
8.5	25	7.5	15.2
9	25	8	15.6
9.5	26	8.5	15.9
10	27	9	16.5

Jordan Shoes

Men's
US	European	UK	centimeters (cm)
7.5	40.5	6.5	25
8	41	7	25.4
8.5	42	7.5	25.8
9	42.5	8	26.2
9.5	43	8.5	26.7
10	44	9	27.1
10.5	44.5	9.5	27.5
11	45	10	27.9
11.5	45.5	10.5	28.3
12	46	11	28.8
13	47.5	12	29.6
14	48.5	13	30.5
15	49.5	14	31.3
Women's
US	European	UK	centimeters (cm)
5	35.5	2.5	22
5.5	36	3	22.4
6	36.5	3.5	22.9
6.5	37.5	4	23.3
7	38	4.5	23.7
7.5	38.5	5	24.1
8	39	5.5	24.5
8.5	40	6	25
9	40.5	6.5	25.4
9.5	41	7	25.8
10	42	7.5	26.2
10.5	42.5	8	26.7
11	43	8.5	27.1
11.5	44	9	27.5
12	44.5	9.5	27.9
Kids'
US	European	UK	centimeters (cm)
4	36	3.5	23
4.5	36.5	4	23.5
5	37.5	4.5	23.5
5.5	38	5	24
6	38.5	5.5	24
6.5	39	6	24.5
7	40	6	25
Preschool
US	European	UK	centimeters (cm)
10.5	27.5	10	16.5
11	28	10.5	17
11.5	28.5	11	17.5
12	29.5	11.5	18
12.5	30	12	18.5
13	31	12.5	19
13.5	31.5	13	19.5
1	32	13.5	20
1.5	33	1	20.5
2	33.5	1.5	21
2.5	34	2	21.5
3	35	2.5	22
Toddler
US	European	UK	centimeters (cm)
3.5	19	2.5	10.8
4	19	3	11.4
4.5	20	3.5	11.7
5	20	4	12.1
5.5	21	4.5	12.7
6	22	5	13
6.5	22	5.5	13.3
7	23	6	14
7.5	23	6.5	14.3
8	24	7	14.6
8.5	25	7.5	15.2
9	25	8	15.6
9.5	26	8.5	15.9
10	27	9	16.5

Reebok Shoes

Men's
US	European	UK	centimeters (cm)
6.5	38.5	5.5	24.5
7	39	6	25
7.5	40	6.5	25.5
8	40.5	7	26
8.5	41	7.5	26.5
9	42	8	27
9.5	42.5	8.5	27.5
10	43	9	28
10.5	44	9.5	28.5
11	44.5	10	29
11.5	45	10.5	29.5
12	45.5	11	30
12.5	46	11.5	30.5
13	47	12	31
13.5	48	12.5	31.5
14	48.5	13	32
15	50	14	33
16	52	15	34
17	53.5	16	35
18	55	17	35
Women's
US	European	UK	centimeters (cm)
5	35	2.5	22
5.5	35.5	3	22.5
6	36	3.5	23
6.5	37	4	23.5
7	37.5	4.5	24
7.5	38	5	24.5
8	38.5	5.5	25
8.5	39	6	25.5
9	40	6.5	26
9.5	40.5	7	26.5
10	41	7.5	27
10.5	42	8	27.5
11	42.5	8.5	28
12	44	9.5	29
Kids'
US	European	UK	centimeters (cm)
4	35	3.5	23
4.5	36	4	23.5
5	36.5	4.5	23.5
5.5	37	5	24
6	38	5.5	24.5
6.5	38.5	6	24.5
7	39	6.5	25

Adidas Shoes

Men's
US	European	UK	centimeters (cm)
6	38 2/3	5.5	24
6.5	39 1/3	6	24.5
7	40	6.5	25
7.5	40 2/3	7	25.5
8	41 1/3	7.5	26
8.5	42	8	26.5
9	42 2/3	8.5	27
9.5	43 1/3	9	27.5
10	44	9.5	28
10.5	44 2/3	10	28.5
11	45 1/3	10.5	29
11.5	46	11	29.5
12	46 2/3	11.5	30
12.5	47 1/3	12	30.5
13	48	12.5	31
14	49 1/3	13.5	32
15	50 2/3	14.5	33
16	51 1/3	15	33.5
17	52 2/3	16	34.5
18	53 1/3	17	25.5
Women's
US	European	UK	centimeters (cm)
5	36	3.5	22
5.5	36 2/3	4	22.5
6	37 1/3	4.5	23
6.5	38	5	23.5
7	38 2/3	5.5	24
7.5	39 1/3	6	24.5
8	40	6.5	25
8.5	40 2/3	7	25.5
9	41 1/3	7.5	26
9.5	42	8	26.5
10	42 2/3	8.5	27
10.5	43 1/3	9	27.5
11	44	9.5	28
11.5	44 2/3	10	28.5
12	45 1/3	10.5	29
13	46 2/3	11.5	30
14	48	12.5	31
Kids'
US	European	UK	centimeters (cm)
3.5	34.5	3	22.5
4	35	3.5	23.5
4.5	36	4	23.5
5	36.5	4.5	23.5
5.5	37	5	24
6	38	5.5	24.5
Preschool
US	European	UK	centimeters (cm)
10	26.5	9.5	16
10.5	27	10	16.5
11	27.5	10.5	17
11.5	28	11	17.5
12	28.5	11.5	18
12.5	29	12	18.5
13	30.5	12.5	19

Most Other Brands

Men's
US	European	UK	centimeters (cm)
6	38	5	23.5
6.5	38.5	5.5	24
7	39	6	24.5
7.5	40	6.5	25
8	41	7	25.5
8.5	41.5	7.5	26
9	42	8	26.5
9.5	42.5	8.5	27
10	43	9	27.5
10.5	43.5	9.5	28
11	44	10	28.5
11.5	44.5	10.5	29
12	45	11	29.5
13	46	12	30
14	47	13	30.5
15	48	14	31
Women's
US	European	UK	centimeters (cm)
5	36	3.5	23
5.5	37	4	23.5
6	37.5	4.5	24
6.5	38	5	24.5
7	38.5	5.5	25
7.5	39	6	25.5
8	39.5	6.5	26
8.5	40	7	26.5
9	41	7.5	27
9.5	42	8	27.5
10	42.5	8.5	28
10.5	43	9	27.5
11	44	9.5	29
11.5	44.5	10	29.5
12	44.5	10.5	30
Kids'
US	European	UK	centimeters (cm)
4	36	3.5	23
4.5	36.5	4	23.5
5	37.5	4.5	23.5
5.5	38	5	24
6	38.5	5.5	24
6.5	39	6	24.5
7	40	6	25
Preschool
US	European	UK	centimeters (cm)
9	27	8	25
10	28	9	26.5
11	29	10	28
12	30	11	29.5
13	31	12	30.5
1	32	13	32
1.5	33	1	33
2	34	2	33.5
Toddler
US	European	UK	centimeters (cm)
3.5	19	2.5	10.8
4	19	3	11.4
4.5	20	3.5	11.7
5	20	4	12.1
5.5	21	4.5	12.7
6	22	5	13
6.5	22	5.5	13.3
7	23	6	14
7.5	23	6.5	14.3
8	24	7	14.6
8.5	25	7.5	15.2
9	25	8	15.6
9.5	26	8.5	15.9
10	27	9	16.5

Nike Apparel

Men's
SIZE	AVG. US SIZE	CHEST (in)	WAIST (in)	HIPS (in)
S	–	35 – 37.5	29 – 32	35 – 37.5
M	–	37.5 – 41	32 – 35	37.5 – 41
L	–	41 – 44	35 – 38	41 – 44
XL	–	44 – 48.5	38 – 43	44 – 47
XXL	–	48.5 – 53.5	43 – 47.5	47 – 50.5
Women's
SIZE	AVG. US SIZE	CHEST (in)	WAIST (in)	HIPS (in)
XS	0 – 2	29.5 – 32.5	23.5 – 26	33 – 35.5
S	4 – 6	32.5 – 35.5	26 – 29	35.5 – 38.5
M	8 – 10	35.5 – 38	29 – 31.5	38.5 – 41
L	12 – 14	38 – 41	31.5 – 34.5	41 – 44
XL	16 – 18	41 – 44.5	34.5 – 38.5	44 – 47

Puma Apparel

Men's
SIZE	CHEST (in)	WAIST (in)	SLEEVES (in)	IN-SEAM (in)
XS	33	30	33	31
S	36	32	34	31.5
M	39	34	34.5	32
L	42	37	36	32
XL	45	41	36.5	32.5
Women's
SIZE	BUST (in)	WAIST (in)	SLEEVES (in)	IN-SEAM (in)
XXS	31	24	35	30.5
XS	33	25	36	31
S	34	26	37	31
M	36	29	39	31
L	38	31	41	31.5
XL	40	34	44	32

Adidas Apparel

Men's
SIZE	AVG. US SIZE	CHEST (in)	WAIST (in)	HIPS (in)
S	–	34 – 37	30 – 32	35 – 37
M	–	37 – 40	32 – 35	37 – 40
L	–	40 – 44	35 – 39	40 – 44
XL	–	44 – 48	39 – 43	44 – 48
XXL	–	48 – 52	43 – 47	48 – 51
Women's
SIZE	AVG. US SIZE	CHEST (in)	WAIST (in)	HIPS (in)
XS	0 – 2	30 – 32	24 – 26	33.5 – 35.5
S	4 – 6	32.5 – 34.5	26.5 – 28.5	36 – 38
M	8 – 10	35 – 37	29 – 31	38.5 – 40.5
L	12 – 14	37.5 – 40	31.5 – 33.5	41 – 43
XL	16 – 18	40.5 – 43	34 – 37	43.5 – 46

Champion Apparel

Men's
SIZE	AVG. US SIZE	CHEST (in)	WAIST (in)	IN-SEAM (in)
S	–	34 – 36	28 – 30	29
M	–	38 – 40	32 – 34	31
L	–	42 – 44	36 – 38	32
XL	–	46 – 48	40 – 42	32.5
XXL	–	50 – 52	44 – 46	33
Women's
SIZE	AVG. US SIZE	CHEST (in)	WAIST (in)	HIPS (in)
XS	0 – 2	30 – 32	22 – 24	32 – 34
S	4 – 6	32.5 – 34.5	24.5 – 26.5	34.5 – 36.5
M	8 – 10	35 – 37	27 – 29	37 – 39
L	12 – 14	37.5 – 39.5	29.5 – 32.5	39.5 – 42.5
XL	16 – 18	40 – 42	33 – 36	43 – 46