A varistor has a varistor element body, and an external electrode disposed on the varistor element body. The p-type drain layer has an annular structure or horseshoe-shaped structure, or is divided into a plurality of portions. The first one of the second plurality of transistors amplifies the mirrored bias current and transmits the amplified bias current to a second one of the second plurality of transistors. A tether is mated with the latch. Such coffee cherries and portions thereof may be particularly characterized by their extremely low concentration of mycotoxins, including various aflatoxins, fumonisins, ochratoxins, andor vomitoxin. The mechanism for tightening the inner envelope has at least one rear keeper affixed to the outer envelope, the rear keeper being located substantially toward the heel of the boot.