Another month, another hot release from Underwear Nation. For the month of April the theme is “Spring Fever” and photographer Jerrad Matthew had the lucky task of snapping pics of model Shane Nickels in this month’s featured underwear, Pump! Underwear’s Fever Brief, Trunk and Jock. See the entire collection here. ou can follow Underwear Nation on Twitter @underwearnation and visit its website underwearnation.com. You can also follow Pump! Underwear on Twitter @pumpunderwear and visit its website pumpunderwear.com.