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When the bike builders at Stringbike set out to create a completely different bicycle, they opted for a completely unique drive system that uses paracord wrapped around a spring-loaded drum instead of the standard chain and cog system. That’s right, the Stringbike doesn’t have a chain. Power is distributed equally to both sides from the individual systems connected to each pedal, kind of like electric cars with individual wheel motors. If you opt for a multi-speed option, gear changes happen with the mechanism sliding up or down, moving plates as opposed to onto different cogs. The new system is much quieter, more balanced and, most importantly, won’t leave your calves covered in grease. The Stringbike is available in E line (carbon), A line (aluminum), S line (single speed) and D signers (limited series) options with prices starting at $1,100.

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It’s time to finally put sleepless nights and groggy mornings to rest for good with a new Casper mattress. Using a combination of multiple foams and a breathable design, the Casper mattress helps you sleep cool and comfortably with just the right amount of sink and bounce. But don’t just take our word for it, try a Casper mattress for 100 nights as part of their sleep-on-it trial. Plus, Cool Material readers can save $50 on the mattress with code COOLMATERIAL. It’s time to get better sleep.