This is totally non-road trip, but could you put an actual sock over your diffuser to help reduce frizz and heat damage?
CG as of Feb. 2012combination hair.
2c on top - low elasticity
3a&b scattered underneath - normal elasticity.
fine texture. thin density. A lot of it.
: normal to high.
loves protein and moisture.
BSACV as needed.
products may vary. i'm a PJ.
loving Curl Junkie, Curly Kinks, and AS I Am.