Agreed with with dalava. Assuming you have a standard road bike that won't fit 30mm+ tires, get the widest that will fit. I use the Conti 4 seasons. Then drop the pressure a bit. Typically, a good starting point is going down 10 psi for every size you go up. This will improve traction without increasing the risk of pinch flats.

What do you weigh, what width tires do you have and what pressure do use now? And what model Bonti? I don't know their line up very well, but they probable make an all season tire of some sort.