Human Hair Extensions Just POP them on!  Now anyone can easily and affordably add length, volume, texture and/or highlights to their own hair with Put On Pieces®clip-in 100% fine human hair extensions.  Affordable, lightweight and easy to attach, these virtually undetectable extensions can be put in and taken out in a matter of minutes.  Thin and fine hair becomes thick and full.  Short hair transforms to long, luxurious hair.