Key Lime Margarita Pie

1 ¼ cups crushed pretzels
¼ cup sugar
6 Tablespoons butter or margarine, melted
1 can (14 ounce) sweetened condensed milk
½ cup lime juice
1 envelope Kool-Aid lemon lime Unsweetened soft drink mix
1 tub (8ounce) Cool Whip topping, thawed, divided

Mix crushed pretzels, sugar and butter. Press firmly onto bottom and up side of 9-inch pie plate. Refrigerate until ready to fill.

Combine condensed milk, lime juice and drink mix in large bowl until well blended. Remove ½ cup whipped topping; set aside. Gently stir in remaining 2 ½ cups whipped topping. Pour into crust.

Freeze 6 hours or overnight. Let stand at room temperature 15 minutes or until pie can be cut easily. Garnish with reserved whipped topping before serving. Store leftover pie in freezer.