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: Brooks Dyad 7 M Women Running Sportshoes Trainer black, shoe size:EUR 38
Product feature: Mesh Synthetic, Package Dimensions: 11.6 x 7 x 4.7 inches, Shipping Weight: 1.7 pounds, ASIN: B00AOQ59HE, Item model number: 1201151B630, Date first listed on Amazon: July 4, 2013, Average Customer Review: 4.5 out of 5 stars 2 customer reviews
Target attributes: Silhouette
Answer: attribute: silhouette
value: None
source: None