From their site: From unexpected downpours to tired feet, KEEN Hybrid.ology is about eliminating the effects of anything that comes between you and your HybridLife. KEEN Hybrid.ology ensures superior fit, extra durability, unending comfort and exceptional performance. It also gives us an excuse to say things like metatomical footbed, quin-density midsole and low durameter EVA.

BOULEVARD COLLECTION:
Typically fit wider because of a generous toebox.  Here’s more info from their FAQ: KEEN shoes have a bit wider toe box than other shoes, but our actual shoe widths are standard. Our women's shoes come only in a 'B' width, while our men's feature a 'D' width (except the men's Yogui, which is an 'E' width). We now have the men's San Antonio (all versions) style in our BLVD category that is available in standard and wide sizes (“E” width). Note that each style fits according to intended use. Trail running and hiking styles have a more snug performance fit, whereas BLVD category styles built for urban trekking have a more accommodating fit[…] Also remember that any KEEN style featuring the adjustable elastic bungee lace closure accommodates various foot widths.  More »

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