The Straw Hat Bike Helmet Cover Only is specifically designed to fit the YAKKAY Smart 2 bicycle helmet, and for this helmet only, we guarantee that the cover will stay in place at speeds up to 30 mph.
However, some customers have tried the Straw Hat cover on other helmet brands with some luck. At their suggestion I started experimenting with combining a Thousand Heritage Collection Helmet with the Bike Pretty Straw Hat Helmet Covers.
Thousand Helmets come in three different sizes. I tested each one and found the pairing that fits best.