These excellent traction aids are extremely easy to use, and very effective.  I took them out today in about 6 inches of wet sloppy snow on extremely hilly conditions, and they performed admirably!  There is no way I could have safely made it up or down these hills without them, and I don't know if I would have had such an easy time with another traction aid.  The inclines were probably 40 to 45 degrees, covered with 6 inches of wet, slippery snow.  They have a one year warranty, and I highly recommend them!