I have never had a pair of Kate spade sunglasses before but Ive had a couple pairs of coach glasses and they felt heavy and solid...  I expected these to be similar quality but they are very lightweight and feel similar quality to what you would find at Target or Walmart...
also, the online photo shows more of a cat eye appearance while these are a taller chunkier/oversized style.  Im not sure they are genuine Kate Spade but will try to compare them next time I go to the mall.  The lenses provide slight darkening and I squint in bright sunshine.
They say kate spade and made in China  inside the arm  
On the plus side...  the case is fantastic and the glasses are comfortable and look nice even though the cat eye is much more subtle than the photo shows.
I will probably return them because of the quality and level of darkening.  I will add pics to show the shape and transparency.