Underhair French Wave 12" 
 color #18/22  (trimmed)

 Underhair Silky Straight 18" 
 color #33 (curled)

 Underhair Silky Straight 12" 
 color #8.

 Underhair Silky Straight 12"  color #4 (slightly layerd)
Underhair Silky-Straight 12" color #22 (curled under)

More photos of the Underhair in various lengths, colors, etc.