1) Product overview
+ Product name: Weather Wizard — children's helmet/safety helmet (bicycle/kid helmet, no battery)
+ Purpose: Help children recognize the environmental temperature through color-changing paint (heat-sensitive). Increase education and safety.
2) Size & form (general standard)
Head circumference: 50–54 cm (Grow-With-Me: 49 → 55 cm).
Length (forehead → nape): 24–26 cm.
Width (ear → ear): 18–20 cm.
Crown height: 13–15 cm.
Front-back brim: 3.5–4.5 cm. (No extra 0.5 cm like Luminous Friend).
Foam padding: 1.5–2.0 cm thick, multiple holes Ø 0.8–1.0 cm.
Target weight: 220–260 g.
3) Materials
Outer shell: Polycarbonate (in-mold) or ABS. Finished with thermochromic paint, with a clear protective coat 0.2 mm against scratches.
Absorbent layer: EPS/EPP such as Luminous Friend.
Inner padding: CoolMax or bamboo-blend, removable and washable.
Straps & buckles: Nylon 12–15 mm + side-release buckle.
Color-changing technology
Thermochromic paint changes color from blue → yellow → red when the temperature increases (approx. 25°C → 37°C).
No batteries required, safe for children.
4) Inspection
Complies with EN1078 / TCVN 5756:2015. Check the paint durability after 200 hot/cold cycles.
5) Lifespan
3–5 years (replace after major impact). Thermosensitive paints last 5–7 years, gradually decreasing in sensitivity to UV.