These 2 Charts Sum Up Everything That's Going Wrong For Lululemon

"We were on track to deliver on our sales and earnings guidance through the month of December; however, since the beginning of January, we have seen traffic and sales trends decelerate meaningfully," said CFO John Currie. "Based on this recent performance and assuming these trends continue through the remainder of January, we are reducing our outlook for the fourth quarter."

The stock is down 12% in premarket trading.

Retail guru Brian Sozzi of Belus Capital Advisors tweeted at Business Insider, reminding us that these two charts from December explain why lululemon shares have fallen out of favor.

"Outside of comps having peaked many quarters ago, Lululemon has not found a way to more efficiently and consistently develop its product to drive gross margin expansion relative to the comp slowdown," he said at the time.

Sozzi continued:

When it DID try and develop its products a little cheaper, #SeeThroughGate reared its ugly head. That is why with increasing competitors attempting to replicate Lululemon's success in a low barrier to entry industry (a strong social media community does not qualify as having a wide moat...), which is eating into market share (see in the comp trend), made it especially critical for the company to bring in a new CEO, as it did, with a deep operations background. The goal for him will not only be to reignite comps through new categories and global expansion, but to find ways to re-engineer the product to bring down costs and set gross margins back into expansionary territory (and then prepare them for another slowdown cycle well off into the future).

By #SeeThroughGate, Sozzi is referring to customer complaining that Lululemon's yoga pants were see-through.

Sozzi doesn't recommend investing in Lululemon.