A Future Equity Agreement (SAFE) gives you the right to future shares in the company. If you invest, you're betting the company will be worth more than $33M eventually.
I'm investing in MTailor because of Miles. I've known Miles for a long time and he's one of the most intelligent and tenacious people I know. Miles is someone who won't ever give up once he's set his mind on something, which he's demonstrated in his dedication to MTailor.
As for MeasureUP, it's a product that will exist. It solves a huge problem for both retailers and customers, and has the potential to expand the TAM of not just online clothing retail, but clothing retail as a whole. I believe that Miles and team can build a compelling product with the data that they've collected from their users along with their years of dedication to this problem.