Prominent advocates of the "profly" progression of the butterfly include Canadian coaches François Allaire and Benoit Allaire. Many believe that the advent of the Profly style was made possible by improved, heavily armored chest/arm pads and more protective face masks. Prior to these advancements, goaltenders wore chest/arm pads made of felt. To avoid injury, goalies had to trap all pucks with their gloves. Modern, lightweight plastics and energy absorbent foams allowed goaltenders to block and trap shots with their bodies. Equipment designers such as Michel Lefebvre (of Koho and Reebok fame), Michael Vaughn of Vaughn Custom Sports and the late Brian Heaton (of Brian's and Heaton fame) were at the forefront of the equipment advancements. Patrick Roy worked with the Allaire brothers and used Lefebvre-designed pads and Heaton-designed gloves in the late 1980s to modernize the style.