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: Lian LifeStyle Women's 2 Pairs Thick Cashmere Wool Blend Crew Socks Plain Color Size 8-11
Product description: These new classical design women's cashmere wool blend crew socks are thick and very warm for cold weather. They are three times thicker than average cotton socks and 5-6 times warmer than cotton socks. These women winter socks are very soft, comfortable and lightweight!
Product feature: Imported, CASHMERE WOOL BLEND CREW SOCKS: Soft and comfortable women's thick Cashmere wool blend socks for cold weather!, WARM AND COMFY LADY CREW SOCKS: Extra thick design to keep your feet warm without making your feet sweat in cold seasons!, Size: One Size (US 7-9), EXTREMELY LIGHT WEIGHT AND SOFT CREW SOCKS: Item weight is 2.6 OZ per pair and very soft!, STYLISH COLORS: Navy Blue,Sky Blue,Black,Beige,Light Gray, Dark Gray, Purple, Orange, Tan, Pink, Coffee and Red, Product Dimensions: 8 x 4 x 1.5 inches, Shipping Weight: 0.32 ounces, ASIN: B01BXI95NK, Date first listed on Amazon: February 19, 2016, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product brand: Lian LifeStyle
Target attributes: Style
Answer: attribute: style
value: crew
source: product feature
attribute: style
value: crew
source: product title
attribute: style
value: crew
source: product description