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: DESMIIT Men's Boxer Shorts Slim
Product description: The size for all underwear products are asian size. Please pay a attention before you make order. If you shopping the underwear from U.S.A or EU brands,should be choice one size up.
Product feature: 47.5% modal + 47.5% cotton + 5% Spandex, Elastic waist: flexibility and high quality, U Convex Pouch design, so you look more strong, The size for all item products are asian size. Please pay a attention before you make order. If you shopping the item from U.S.A or EU brands,should be choice one size up., Super comfortable and soft, Shipping Information: View shipping rates and policies, ASIN: B00S27X064, Item model number: U402, Date first listed on Amazon: January 10, 2015, Average Customer Review: 1.0 out of 5 stars 1 customer review
Product price: $12.99
Product brand: DESMIIT
Target attributes: Silhouette
Answer: attribute: silhouette
value: boxer shorts
source: product title