Lululemon shares are tanking Friday after the company issued soft forward guidance for the year ahead, despite beating estimates on the top and bottom line for the fourth quarter.

Lululemon reported a strong fourth quarter where revenue increased 13%. But the popular active-wear retailer had a modest outlook for this year based on uncertainty about tariffs and lower consumer spending. Its stock dropped on the lower-than-expected guidance.

Lululemon stock fell 15% in afternoon trading after CEO Calvin McDonald said consumers are beginning to spend less in response to increased fears about the US economy.