Purchase 1 pair and get $10 off **. Purchase 2 or 3 pairs and get $15 off those + the $10 off the 1st pair**. And if you purchase 4 pairs, you get $20 off that 4th pair + $15 off the 2nd and 3rd + $10 off the 1st + $20 off each pair thereafter**. 144 more words