The it shoe for Silicon Valley techies just raised $17.5 million from a host of investors — fortifying its plan to open retail stores and to expand outside the US.

Fans of the $95-a-pair all-wool Allbirds shoes — including Larry Page, Ryan Seacrest, Matthew McConaughey and Camila Alves — rave about their comfort and sustainable materials.

Allbirds’ shtick is that it claims to meet rigorous environmental standards, including animal welfare protections.

“We think the footwear category relies too heavily on synthetic materials,” Brown told The Post, adding that the funding will help Allbirds develop products using other natural materials besides wool and leather. Its moisture-wicking unisex shoes are meant to be worn without socks and thrown into the washer as needed.

The funding will be used to open stores — a pop-up is opening in SoHo this month — and to expand to new markets outside the US and New Zealand, Zwillinger said.

Allbirds’ Series B funding came from Tiger Global Management, which has funded Spotify, Warby Parker, Peloton and Facebook. The company’s total funding has now reached $27.5 million.

Allbirds was founded by Tim Brown, a former New Zealand soccer star, and Joey Zwillinger, a former Goldman Sachs analyst.

The funding will be used to open stores — a pop-up is opening in Soho this month — and to expand to new markets outside the US and New Zealand, Zwillinger said.