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Home Brands T Troy Lee Designs Bicycle Helmets Troy Lee Designs D4 Composite MIPS Lined Up Downhill Helmet

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Troy Lee Designs D4 Composite MIPS Lined Up Downhill Helmet

from Troy Lee Designs

Size: XS (53/54)

Please note: Helmets displayed with black or mirrored visors, will always be delivered with a clear visor!

£338.44

Net price plus shipping; you may be liable for taxes & duties in the destination country

We expect the product to be available as of 27/04/2026

Notify on availability

9 stores in Germany

Order your product online for pick-up at one of the stores.
How it works

Description
Size chart

Description

Troy Lee Designs D4 Composite MIPS Lined Up Downhill Helmet

Always evolving, the D4 Composite achieves a remarkably low 1050 g thanks to an aerospace-inspired shell design and premium materials—without sacrificing strength. The Mips® C2 rotational impact protection system adds an extra layer of safety in the event of a fall, while the front air intake routes cooling airflow through the polymer center and Power Grid side mesh to help keep your head cooler on the ride. X-Static® and XT2® anti-microbial / anti-odor padding keeps the interior fresh and comfortable.

Features:

Mips® C2 rotational impact protection system to help reduce rotational forces during angled impacts
Three outer shell sizes with graduated padding options for true incremental sizing
Anatomically contoured anti-microbial 3D cheek pads for quick-release emergency removal
Removable snap-in, washable comfort liner with Coolmax® and Dri-lex® moisture-wicking materials
Added EPS and a new headform shape for improved impact performance
EPP Collarbone Impact System to help reduce forces to the collarbone and shoulders
Purpose-built internal cavities for audio integration
Front air intake cooling system flowing through the polymer center and Power Grid side mesh
Smart Shear breakaway visor screws for controlled break-away on impact

Specifications:

Outer shell: Composite
Outer shell sizes: 3
Closure: Stainless steel Double-D ring
Weight: 1050 g
Standards: CPSC 1203 / EN 1078 / ASTM F1952 (DH) / ASTM F2032 & F2040 (BMX) (depending on regional standards)
Equipped with Mips® C2
Rider category: Premium downhill/BMX race

Contents:

1× Troy Lee Designs D4 Composite MIPS Lined Up Downhill Helmet
1x Helmet Bag

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Additional product information

Features	Emergency system padding
Buckle	Double-D

How to take correct measurements »

Helmets

SE2 & Air
Ordering size	XS	S	M	L	XL	2XL
Head circumference (cm)	53-54	54-56	56-58	58-60	60-62	62-63

D2
Ordering size	XS/S	M/L	XL/2XL
Head circumference (cm)	53-55	56-59	60-62

D3
Ordering size	XS	S	M	L	XL	2XL
Head circumference (cm)	52-53	54-55	56-57	58-69	60-62	63-65

Knee protectors

Knee protectors
Ordering size	S	M	L	XL	2XL
Thigh circumference (cm)	37-43	43-49,5	49,5-57	57-65	57-76
Calf circumference (cm)	29-33	33-37	37-42	42-47	47-56
Knee circumference (cm)	29-33	33-38	38-43	43-48	48-56

Trousers

Kids – Grand Prix pants relaxed fit
Ordering size	18	20	22	24	26	28
Waist circumference (cm)	41	46	51	56	61	66
Inside leg length (cm)	44	49	53	56	59	61
Outer leg length (cm)	63	70	73	78	83	87

Kids – Grand Prix pants stretched fit
Ordering size	18	20	22	24	26	28
Waist circumference (cm)	51	56	61	66	71	76
Inside leg length (cm)	44	49	53	56	59	61
Outer leg length (cm)	63	70	73	78	83	87

Girls – Moto shorts
Ordering size	S (3/4)	M (5/6)	L (7/8)	XL (9/10)
Waist circumference (relaxed fit) (cm)	73.5	78.5	84	89
Waist circumference (streched fit) (cm)	78.5	84	89	94
Inside leg length (cm)	29	31	32	34
Hip circumference (cm)	98	103	108	113

Girls – Grant Prix pants
Ordering size	3/4	5/6	7/8	9/10	11/12
Waist circumference (relaxed fit) (cm)	74	79	84	89	94
Waist circumference (stretched fit) (cm)	79	84	89	94	99
Inside leg length (cm)	79	80	82	82	82
Outer leg length (cm)	104	105	107	107	107

Girls – Rev pants
Ordering size	3/4	5/6	7/8	9/10	11/12
Waist circumference (relaxed fit) (cm)	70	74	79	84	89
Waist circumference (stretched fit) (cm)	75	79	84	89	94
Inside leg length (cm)	84	85	85	85	86
Outer leg length (cm)	103	103	103	103	107

Jeans
Ordering size	30-32	34-36	38-40
Waist circumference (relaxed fit) (cm)	76-81	83-91	96-102
Inside leg length (cm)	79	81	84

Men – shorts SE, SE PRO, GP & GP AIR
Ordering size	28	30	32	34	36	38	40	42	44
Hip width (relaxed fit) (cm)	73.5	78.5	84	89	94	99	104	109	114.5
Hip width (stretched fit) (cm)	84	86.5	91.5	96.5	101.5	106.5	112	117	122
Inside leg length (cm)	77.5	78.5	81.5	82.5	85	86.5	89	91.5	91.5
Outer leg length (cm)	98	100.5	101.5	104	105.5	108	110.5	112	114.5
Knee width (cm)	28	29	30.5	31	32	33	34.5	35	36

Jerseys

Teens – SE, SE PRO, GP, GP AIR & Midnight
Ordering size	XS	S	M	L	XL
Chest width (cm)	35.5	39.5	43	47	51
Front length (cm)	58.5	61	63.5	66	68.5
Sleeve length (cm)	56	61	66	71	76

Men – SE, SE PRO, GP, GP AIR & Midnight
Ordering size	S	M	L	XL	2XL	3XL
Chest width (cm)	53.5	56	58.5	61	65	67.5
Front length (cm)	71	73.5	76	78.5	81	83.5
Sleeve length (cm)	83.5	89	94	96.5	99	99

Men – Skyline
Ordering size	S	M	L	XL	2XL
Chest width (cm)	56	58.5	61	63.5	66
Front length (cm)	62	63.5	66	68.5	71
Sleeve length (cm)	38.5	39.5	40	40.5	41.5

Men - Ruckus
Ordering size	S	M	L	XL	2XL
Chest width (cm)	56	58.5	61	63.5	66
Front length (cm)	62	63.5	66	68.5	71
Sleeve length (cm)	57	58	58.5	59	59.5

Men – Ace
Ordering size	S	M	L	XL
Chest width (cm)	48.5	51	53.5	56
Front length (cm)	55.5	57	59	61
Sleeve length (cm)	34.5	35.5	37	38

Men – Sprint
Ordering size	XS	S	M	L	XL	2XL
Chest width (cm)	51	53.5	56	58.5	61	65
Front length (cm)	66	68.5	71	73.5	76	78.5
Sleeve length (cm)	78.5	81.5	86.5	91.5	94	96.5

	A. Body height: Take off your shoes and stand barefoot with your back against a wall to measure your body height to the top of your head. B. Chest circumference: Measure horizontally around the widest part of your chest. C. Waist circumference: Measure horizontally around your waist. D. Inside leg length: Inside leg measured from the crotch to the ground.
	A. Body height: Take off your shoes and stand barefoot with your back against a wall to measure your body height to the top of your head. B. Chest circumference: Measure horizontally around the widest part of your chest. C. Waist circumference: Measure horizontally around your waist. D. Inside leg length: Inside leg measured from the crotch to the ground.
	A. Measure the circumference of your head to get the correct helmet size. Use a measuring tape around the widest point of your head (approx. 1 cm above the ears).
	A. Place both feet on a sheet of paper. Draw a vertical line to mark the tip and heel end of your foot. B. Measure the lengths of both feet. C. Compare the length of the bigger foot with the size table to find your perfect shoe size.
	A. Measure the circumference of your hand at the widest point around your palm to find the correct glove size. Copy the value into the table

Browse these categories as well: Helmets, Bicycle Downhill Helmets

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