100% Human Hair Extensions Sleek Crazy for curls Spanish Weave. Non-shedding and tangle-free,Crazy for Curls gives you gorgeous curly hair. These hair extensions are ideal for glue in, weave in, or clip in application. You?ll need around 12 clips for a full head. Sleek hair extensions come in a range of luscious colours. Find your perfect match from the swatches below.