Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: WonderGel "Double" Cushion, 100% Gelastic Gel with Black Polyester Fabric Cover
Product description: This unique WonderGel Double Cushion is designed with 2 integrated layers of gel to supply superb comfort and support. Whether you want to add some comfort to a chair in your home or you use it while you drive, this versatile cushion is a must have.
Product feature: Polyester, Never sacrifice comfort wherever you are sitting with this WonderGel Roll Original Cushion, 100% Gelastic Gel, Polyester fabric cover, Hand wash in warm water with dish soap, Measures 18" L x 16" W x 2" H
Product brand: Wondergel
Target attributes: Chair Type
Answer: attribute: chair type
value: None
source: None