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: Timberland 34972 Youth's 6-in Premium WP Scuff Proof Boot Wheat Scuff Proof Youth
Product feature: ASIN: B004HVYEAA, Date first listed on Amazon: July 3, 2013, Average Customer Review: 4.5 out of 5 stars 2 customer reviews
Target attributes: Heel Style
Answer: attribute: heel style
value: None
source: None