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: Nautica Men's Solid Crew Neck Short Sleeve Pocket T-Shirt
Product description: Simply put, every guy needs a solid collection of pocket t-shirts in his collection. This cotton style from Nautica one ups its classic roots with a touch of stretch so you know it'll fit great and keep its shape for a long time to come.
Product feature: 95% Cotton/5% Spandex, Imported, Machine Wash, Casual crew-neck styling, Short sleeves; pocket at chest with Nautica logo, Package Dimensions: 1 x 1 x 1 inches, Shipping Weight:  pounds ( View shipping rates and policies ), ASIN: B00JN39GOG, Item model number: V41050, Date first listed on Amazon: May 12, 2014, Domestic Shipping: Item can be shipped within U.S., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 4.4 out of 5 stars 349 customer reviews
Product price: $14.85 - $82.90
Target attributes: Sleeve Style
Answer: attribute: sleeve style
value: short sleeves
source: product feature
attribute: sleeve style
value: short sleeve
source: product title