Being Logical: A Guide to Good Thinking

From the Glacier collection, thin caviar rope bracelet with centered blue topaz stone and gold accents. Designed by Lagos.

7.1 surround sound powered by Dolby technology delivers a detailed soundfield ¿ hear your enemies before they see you.

Three swappable headband pads let you choose the best fit, for long-lasting comfort.

Three customizable G keys give you one-touch command over music, voice morphing, and more.

On-ear audio controls provide quick access to volume, microphone mute, and surround sound adjustments.

Adjustable, noise-canceling microph ...

100 percent cotton jersey construction

Ribbed collar with 2-button placket

Pocket on chest with original penguin logo

Folding multi-tool with 37 functions and stainless-steel body

2mm, 3mm, 5mm, and 7.5mm screwdrivers; Phillips head screwdriver

Bottle opener, large knife blade, can opener, metal file, and metal saw

Bit wrench with 6 bits; wood saw and chisel/scraper

Measures 4.5 inches long; weighs 10 ounces; lifetime warranty