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: Kenneth Cole New York Men's Comfortable Soft Fashion Boxer Brief
Product feature: 95% Cotton/5% Spandex, Imported, Machine Wash, Comfortable boxer brief, Brief, Package Dimensions: 8.2 x 6.6 x 1.1 inches, Shipping Weight: 2.4 ounces, ASIN: B00MFRYS0O, Item model number: RNM3131, Date first listed on Amazon: November 9, 2014, Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 4.0 out of 5 stars 3 customer reviews
Target attributes: Silhouette
Answer: attribute: silhouette
value: boxer brief
source: product title
attribute: silhouette
value: boxer brief
source: product feature