¬ This photograph shows the type of SALi padding used in the hats. The capsules are expanded polystyrene beads and the liquid is water with some anti-freeze and a thickening agent added. The beads can be quite stiff, similar to the foam used in hard shelled helmets, but the fit is far more comfortable, because the pads mould to the shape of the wearers head. We can mix the liquid with polymeric microspheres, to reduce the liquid weight. We also envisage adding phase change waxes to aid hat temperature control during vigorous activities.

Could Sassy hats offer a comfortable alternative, to conventional, rigid cycling helmets?

The risk of brain damage to cyclists involved in traffic accidents is high. The risk is reduced, but not eliminated by wearing a helmet. Sassy Hats may be superior to conventional hard helmets for some types of accidents, but research must be done, to verify this.

We are waiting for the PedSALi and CrashSALi projects to deliver research results on the impact energy absorbing performance of different SALi filled bag designs, before applying for further research funding, to look at the potential benefits of Sassy Hat type cycling helmets.

If you have a professional interest in this project please contact us.