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:
It's a nice and thick mat that is good for your knees and elbows, but it's a slippery mat. There isn't much grip and if you sweat, you're sliding all over the place without a towel. My cheap Target mat had more grip than this one. I would say spend less on a mat that has more grip. I regret buying this one.

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