The D4 range of cycling helmets, which reigns supreme among full-face helmets, expands with a polyacrylate model that offers the same safety and comfort features as premium carbon and composite models in a cost-effective shell.
Details make the D4 the most desirable full-face mountain bike helmet, including Mips® C2 brain protection, an air intake system for ventilation and an unmatched anatomical fit.
- High-flow front air intake system via polymer center and power grid side mesh.
- Quick-release molded 3D cheekbones for an anatomically optimized fit.
- Mips® C2 rotational impact brain protection system
- Advanced polyacrylate shell construction
- Clavicle suspension system
- Breakaway visor screws
- Antimicrobial padding
Material: polyacrylic
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 |
