[0.175 lb] I bought them for field monitoring sound, they are comfortable and seem durable. I find I'm using them a lot at the editing console just to listen to music on the XM feed. I'm astounded at the discrete highs and then the drum/base punch on the jazz tracks I'm listening to right now. Volume is low, I can hear my keyboard clicks, but the music is wonderful.

[Dynamic] It's annoying to hear someone's loud music coming out of their earbuds or headset. I don't want to be one of them, but I want to enjoy my music sometimes. This set does not leak any sound (unless you turn the volume unnecessarily high!), just like the Koss earbuds I already own. The color is a very nice as shown on the page. It's very affordable and I'm glad I got this.

[Semi-Open-Back] Ive been buying these headphones from back when they were Optimus branded and sold at Radio Shack.  They sound insanely good for the weight/price, great for situations where you need critical audio all day but dont want to wear heavy cans or in ear monitors.

[80 Hz to 18 kHz] These light simple headphones have replaced studio quality ones costing hundreds more in all applications around my home. As a musician, quality & fidelity reign supreme, but value is always appreciated too. These sound as good as ANY I've ever owned at any price. I give them as gifts to friends now, they are simply that good!

[Dynamic] light and versatile

[Dynamic] For this low of a price, I have not found a better sounding headphone---it destroys some headphones at 3 to 4 times its price. I play music ( hobby) and my tastes are varied--will listen to anything--love jazz/fusion/ rock/classical/electronic/world/gospel/acoustic/new age / DCI drum corps. I am running a standard laptop and an old Audioquest Dragonfly v1.0 DAC--poor man's budget stuff, nothing fancy. With this combo, depth, soundstage, instrument timbres and tonal balance are amazing at this price. CONS: semi-fragile construction--take care of them ( ! ), presently a goofy look ( consumers may want to get out the Krylon !-- my opinion--sorry, Koss ! What happened to the-- more attractive IMHO-- all black KTXPRO design?). Very satisfying sound; I continue to be impressed every time I listen. Personally, I think this is a budget audiophile classic, and I have been a fan of it for decades through its various incarnations ( even back to the Optimus Pro 35 Radio Shack days !) A MUST buy on a budget---you will not be disappointed at this price. Despite the present look ( ! ), well done, Koss !

[80 Hz to 18 kHz] I have been using these headphones at a local library for months to plug into a PC 3.5 mm headphone jack. The in-line volume control means the world because one doesn't need to keep clicking on the GUI volume control icon every time the volume level changes for each website or video. They also work great plugged into my mobile device for work. The foam earpads are comfortable for long periods and the plastic headpiece is easily adjustable on both sides. This second pair I got for leisure use after taking my first pair to work for use there. Get them while they're still making/selling them! I've seen good earphones disappear from online shelves before. B&H is the way to go.

[Stereo] I've been buying these for decades...since they were sold under the Radio Shack branding. They sound just the same today. Also bought some new foam ear pads for some of my older ones. They fit perfectly.

[32 Ohms] I think these sound good for the price point. Certainly sound better than others at this price. Good, full range of sound.

[Semi-Open-Back] enjoying it