At the beginning of the winter season I decided to run outside for the duration of the cold - snow/ice included.  The "dread"mill is a safe bet indoors, but it just isn't the same.  After researching traction devices made for runners I decided on this one. Shortly after receiving it I had the chance to use it as the snow had started falling.  They were quite easy to put on and even included a separate velcro strap in case you needed the extra hold on your shoe.  I skipped the straps and slipped them right on my Brooks ProCadence.  While they added some weight to the shoes which was notable during the run I expected it and it just required a small adjusting period.  I didn't slip at all running over compacted snow, light ice, and even the fluffy stuff.  Overall, for those times you want to run outdoors and the weather isn't cooperating this is a good equalizer!