The Zero Gel ($25 for a two pack) adds the least amount of bulk, but also the least protection – the slim, transparent case is rated for only 1m falls. Spectrum ($20 for one) is where things get more serious – it’s translucent too, but has thicker air pockets that can absorb the shock from 2m falls.
Spectra ($30) is a flip cover with various finishes, imitating carbon fiber or cloth. Spectra Vision (also $30) keeps the flip transparent so you can see the always on screen. Both are rated for 2m drops.
Then there’s the Spina and the Octane (both are $30). The two go for a more rugged look and their armored shell is noticeably bulkier (though they remain at a 2m drop rating).
The Venum is a metallic bumper (2m drops, $30 price), which features a clear back for those that want to see the color of Galaxy S8 they chose.