Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Vibram FiveFingers Men's Spyridon MR Barefoot Shoes Black / Grey 43 & Pemium Toesock Bundle
Product feature: ASIN: B00U9PPI2G, Date first listed on Amazon: June 12, 2015, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product brand: Vibram
Target attributes: Boot Style
Answer: attribute: boot style
value: None
source: None