Our DD, then almost 3yrs old, got a wrap in her hair at the Poly volcano pool. Her hair was shoulder length and it cost us about $30 for the wrap and beads that she chose. She loved it and never complained about it when we washed or brushed her hair. I left it in only about 3 weeks as I was afraid that it could be too much for her very fine "baby" hair if we left it in much longer. Her hair was definitely drier under the hair wrap when we took it out. We just made sure to put lots of hair conditioner in when we washed her hair and it bounce back just fine.
We leave for our next Disney trip in 28 days and DD, now 5yrs old, is looking forward to getting her hair wrapped again.