The D4 is the helmet that dominates podium steps at downhill and BMX events around the world. It combines safety with light weight and the precision appreciated by the best riders.
Thanks to its premium construction and innovative materials, it delivers maximum protection without unnecessary weight. The details that separate winners from the rest – that’s the D4.
- Best brain protection
The Mips® C2 system protects your head from rotational impacts, which are the most dangerous in a crash.
- Ultra-light and comfortable
Weighing just 1000–1150 g and with 20 airflow channels, you’ll barely notice it, while staying protected.
- UD carbon fibre shell
- Three sizes for an optimal fit
- Anatomical 3D-moulded cheek pads
- Emergency release system for rescuers
- Removable, washable and moisture-wicking liner
- Superlight titanium D-rings
- Maximum ventilation and breathability
Specifications:
Weight: 1000–1150 g
Number of vents: 20
Certifications: CPSC 1203, CE EN1078, ASTM F1952-DH, ASTM F2032-BMX
Available versions: Carbon, composite, polyacryl
What started as a hobby for motocross racer Troy Lee, painting helmets for his friends in his parents' garage, has grown to become recognized as the premier helmet painting competition in the world. Troy Lee Designs supplies motocross and mountain bike equipment to the world's fastest racers.
Helmets – head circumference (cm)
These measurements may vary slightly from model to model.
| Model |
YOUTH |
XS |
XS/S |
SM |
MD |
LG |
XL |
Extra Large / Extra Extra Large |
2X |
| D4 |
– |
53–54 |
– |
55–56 |
57–58 |
58–59 |
60–61 |
– |
62–63 |
| D3 |
– |
53 |
– |
54–55 |
56–57 |
58–59 |
60–62 |
– |
63–65 |
| A3 / Stage |
– |
– |
53–56 |
– |
– |
– |
– |
60–63 |
– |
| Flowline / Flowline SE / Grail |
48–53 |
– |
53–56 |
– |
– |
– |
– |
60–63 |
– |
A3 / Stage a Flowline: M/L = 57–59 cm.
Men's jerseys
| Size |
SM |
MD |
LG |
XL |
XXL |
| Center of the front from the shoulder (cm) |
69,9 |
71,8 |
73,7 |
75,6 |
77,5 |
| Center of the back from the shoulder (cm) |
76,2 |
78,1 |
80,0 |
81,9 |
81,9 |
| Bust measurement (cm) |
50,8 |
54,6 |
58,4 |
62,2 |
67,3 |
| Waist size (cm) |
50,2 |
54,0 |
57,8 |
61,6 |
66,7 |
| Sleeve opening (cm) |
9,5 |
10,2 |
10,8 |
11,4 |
12,1 |
| Length of long sleeve from the center of the neck (cm) |
85,1 |
87,6 |
90,2 |
92,7 |
95,3 |
Men's shorts / pants
| Size |
28 |
30 |
32 |
34 |
36 |
38 |
40 |
| Waist size (cm) |
37,5 |
40,0 |
42,5 |
45,1 |
47,6 |
50,2 |
52,7 |
| Length across the hips (cm) |
48,3 |
50,8 |
53,3 |
55,9 |
58,4 |
61,0 |
63,5 |
| Inseam (cm) |
32,4 |
33,7 |
34,9 |
36,2 |
37,5 |
38,7 |
40,0 |
| Leg opening (cm) |
14,0 |
14,6 |
15,2 |
15,9 |
16,5 |
17,1 |
17,8 |
| Inseam – pants (cm) |
80,0 |
82,6 |
82,6 |
82,6 |
85,1 |
85,1 |
85,1 |
Women's jerseys
| Size |
XS |
S |
M |
L |
XL |
| Center of the front from the shoulder (cm) |
59,7 |
62,2 |
63,5 |
65,4 |
66,7 |
| Center of the back from the shoulder (cm) |
67,3 |
69,2 |
71,1 |
73,0 |
74,3 |
| Bust measurement (cm) |
40,0 |
43,8 |
47,6 |
51,4 |
55,2 |
| Waist size (cm) |
37,5 |
41,3 |
45,1 |
48,9 |
52,7 |
| Short sleeve length from the center of the neck (cm) |
11,4 |
13,3 |
15,2 |
17,1 |
19,1 |
Women's shorts / pants
| Size |
XS |
SM |
MD |
LG |
XL |
| Waist size (cm) |
37,5 |
40,0 |
42,5 |
45,1 |
47,6 |
| Length across the hips (cm) |
47,6 |
50,2 |
52,7 |
55,2 |
57,8 |
| Inseam (cm) |
30,5 |
31,8 |
33,0 |
34,3 |
35,6 |
| Leg opening (cm) |
21,6 |
22,9 |
24,1 |
25,4 |
26,7 |
| Inseam – shorts (cm) |
49,5 |
51,4 |
53,3 |
55,2 |
55,2 |
Kids' jerseys
| Size |
XS |
SM |
MD |
LG |
LX |
| Center of the front from the shoulder (cm) |
49,5 |
52,1 |
54,6 |
57,1 |
59,7 |
| Center of the back from the shoulder (cm) |
54,6 |
57,1 |
59,7 |
62,2 |
64,8 |
| Chest circumference (cm) |
35,6 |
38,1 |
40,6 |
43,2 |
45,7 |
| Waist size (cm) |
35,6 |
38,1 |
40,6 |
43,2 |
45,7 |
| Sleeve opening (cm) |
6,99 |
7,62 |
8,26 |
8,89 |
9,53 |
| Sleeve length (cm) |
61 |
63,5 |
66 |
68,6 |
71,1 |
Kids' shorts / pants
| Size |
28 |
30 |
32 |
34 |
36 |
38 |
40 |
| Waist size (cm) |
74,9 |
80 |
85,1 |
90,2 |
95,3 |
100 |
105 |
| Length across the hips (cm) |
88,9 |
94 |
99,1 |
104 |
109 |
114 |
119 |
| Inseam (cm) |
64,1 |
66,7 |
69,2 |
71,8 |
74,3 |
76,8 |
79,4 |
| Leg opening (cm) |
48,3 |
50,2 |
52,1 |
54,0 |
55,9 |
57,8 |
59,7 |
| Inseam – pants (cm) |
30,5 |
33 |
33 |
33 |
35,6 |
35,6 |
35,6 |
| Outer seam – pants (cm) |
53,7 |
57,1 |
58,4 |
59,4 |
63,2 |
64,5 |
65,4 |
Protective gear – adults
Knees: Measure 10 cm above the center of the knee (thigh) and 15 cm below the center of the knee (calf). Elbows: Measure the circumference of the wrist behind the wrist bone and above the bicep at its narrowest point. Chest: Measure approximately 2.5 cm below the armpit.
| Typ |
Rate |
XS/SM |
M/L |
Extra Large / Extra Extra Large |
| Knee |
Lower thigh (cm) |
34,5–39,5 |
39,5–44,5 |
44,5–49,5 |
| Calf (cm) |
32–37 |
37–42 |
42–47 |
| Weight (kg) |
32–63 |
63–82 |
82–100 |
| Elbow |
Wrist (cm) |
15–17,5 |
17,5–20 |
20–22,5 |
| Upper biceps (cm) |
25,5–30,5 |
30,5–35,5 |
35,5–40,5 |
| Weight (kg) |
32–63 |
63–82 |
82–100 |
| Thoracic |
Chest (cm) |
86–89 (S) |
91–97 (M) / 102–107 (L) |
112–117 (XL) |
Protective gear – children
The same measurement instructions as for adults. Chest: Measure approximately 2.5 cm below the armpit.
| Typ |
Rate |
YM |
YL |
| Knee |
Thigh circumference (cm) |
26,5–30,5 |
30,5–34,5 |
| Calf circumference (cm) |
24–28 |
28–32 |
| Elbow |
Wrist (cm) |
15–17,5 |
17,5–20 |
| Upper biceps (cm) |
17,8–22,9 |
22,9–27,9 |
| Thoracic |
Chest (cm) |
66–68.5 (M) |
71–73.5 (L) / 76–81.5 (XL) |
Gloves
| Group |
Size |
Hand circumference (cm) |
Palm length (cm) |
| Men's |
XS |
19–20 |
17,7–18,5 |
| S |
20–21 |
18,5–19 |
| M |
21–21,7 |
19–19,7 |
| L |
21,7–22,7 |
19,7–20,3 |
| XL |
22,7–22,5 |
20,3–20,7 |
| Women's |
XS |
16,5–17,5 |
16–17 |
| S |
17,5–18,2 |
17–17,7 |
| M |
18,2–19 |
17,7–18,3 |
| L |
19–19,7 |
18,3–19 |
| Children's |
XXS |
13,6 |
15,1 |
| XS |
14,4 |
15,8 |
| S |
15,2 |
16,5 |
| M |
16,0 |
17,2 |
| L |
16,8 |
17,9 |
| XL |
17,6 |
18,6 |
