Can Hotspot Shield make your activities invisible to your ISP? Or can they still see what you're downloading if they so choose?

Here's the text from the product description:

Hotspot Shield protects your entire web surfing session; securing your connection at both your home Internet network & Public Internet networks (both wired and wireless). Hotspot Shield protects your identity by ensuring that all web transactions (shopping, filling out forms, downloads) are secured through HTTPS. Hotspot Shield also makes you private online making your identity invisible to third party websites and ISP’s.

I'm just not sure what it means by "invisible to third-party websites and ISPs" and if that means the ISP can still see what I'm doing.