Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
Afforded no comfort but it did keep you warm.  Good insulator but a little bulkier than I would have liked.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: D: negative