As per
http://www.ehow.com/facts_7570867_wi...er-blades.html
"Winter wiper blades are specially built to withstand snow and ice. In colder conditions, regular [all-season] blades can acquire a buildup of ice chips or frozen snow inside and around the blade. The result is often streaks on your windshield and decreased vision. Winter wiper blades have a rubber or vinyl wrapping around the blade, blocking ice and snow from entering between the metal arms of the wiper.
All-season wiper blades are made to clear water, snow and ice away from a windshield. They are usually built with multiple or reinforced rubber blades to help handle any and all elements. They do not, however, have the rubber or vinyl wrapping of winter wiper blades.
... if you live in a region where heavy snow and ice are common, spending the extra money to equip your vehicle with winter blades means you'll have a safer ride
(i.e. better visibility)."
Total paid for the set was $41.67 including taxes (see previous post for individual sale prices).
I'll be switching to all-season wipers in the spring.