problem is with most extensions tht are real hair - they coat the hair in silicone and enzymes and after a while this wears off and thts when the hair loses its shine/softness.

keep doing deep conditioning treatments
use loads of leave in conditioner
use blowdry lotion
use a serum/defrizz cream.

i have weaved in extensions tht started gettin dry/matted and being a hairdresser myself i knew what sorta products tht worked...

shampoo wise - i currently use matrix biolage ultra hydrating shampoo or TIGI dumb blonde..

conditioner - matrix ultra hydrating conditioner, tigi dumb blonde conditioner, aussie 3 min miracle conditioner - i usually mix 2 of em together

leave in conditioner - sally's own brand tea tree leave in conditioner, aussie hair insurance leave in conditioner, TIGI ego boost

defrizz/serum - TIGI girls toys, TIGI afterparty, TIGI ego boost, sallys own brand of tea tree defrizz cream

email me if u got ne questions